Viperidae (Vipers)

Family

Vipers

Viperidae

104 species in our catalog · found in 143 parks

KingdomAnimalia (Animals)
PhylumChordata (Chordates)
ClassSquamata
FamilyViperidae (Vipers)

Species in this group

North Philippine Temple Pitviper

Tropidolaemus subannulatus

Daily sighting probability ~90% · Very likely

Ceylon Pit Viper

Craspedocephalus trigonocephalus

Daily sighting probability ~80% · Very likely

Florida Cottonmouth

Agkistrodon conanti

Daily sighting probability ~80% · Very likely

Barba Amarilla

Bothrops atrox

Daily sighting probability ~70% · Very likely

Wagler's Pit Viper

Tropidolaemus wagleri

Daily sighting probability ~70% · Very likely

Godman's Montane Pit Viper

Cerrophidion godmani

Daily sighting probability ~70% · Very likely

Side-striped palm pit viper

Bothriechis lateralis

Daily sighting probability ~70% · Very likely

Green Bush Viper

Atheris chlorechis

Daily sighting probability ~70% · Very likely

White-lipped Island Pitviper

Trimeresurus insularis

Daily sighting probability ~60% · Likely

Northern Cottonmouth

Agkistrodon piscivorus

Daily sighting probability ~60% · Likely

Vogel’s Pit Viper

Trimeresurus vogeli

Daily sighting probability ~60% · Likely

Fer-de-lance

Bothrops asper

Daily sighting probability ~60% · Likely

Prairie Rattlesnake

Crotalus viridis

Daily sighting probability ~50% · Likely

Green Jararaca

Bothrops bilineatus

Daily sighting probability ~50% · Likely

Spot-tailed Pitviper

Trimeresurus erythrurus

Daily sighting probability ~50% · Likely

Adder

Vipera berus

Daily sighting probability ~50% · Likely

Cerrado Lancehead

Bothrops pauloensis

Daily sighting probability ~50% · Likely

Slender Hognose Viper

Porthidium ophryomegas

Daily sighting probability ~50% · Likely

Neotropical Rattlesnake

Crotalus durissus

Daily sighting probability ~50% · Likely

Patagonia Lancehead

Bothrops ammodytoides

Daily sighting probability ~50% · Likely

Puff Adder

Bitis arietans

Daily sighting probability ~50% · Likely

Southwestern Speckled Rattlesnake

Crotalus pyrrhus

Daily sighting probability ~50% · Likely

Painted Lancehead

Bothrops diporus

Daily sighting probability ~50% · Likely

Lowland Hump-nosed Viper

Hypnale zara

Daily sighting probability ~50% · Likely

Western Diamondback Rattlesnake

Crotalus atrox

Daily sighting probability ~40% · Likely

Panamint Rattlesnake

Crotalus stephensi

Daily sighting probability ~40% · Likely

Sabah Bamboo Pitviper

Trimeresurus sabahi

Daily sighting probability ~40% · Likely

Western Rattlesnake

Crotalus oreganus

Daily sighting probability ~40% · Likely

Sidewinder

Crotalus cerastes

Daily sighting probability ~40% · Likely

Ruby-eyed Green Pitviper

Craspedocephalus rubeus

Daily sighting probability ~40% · Likely

Taiwanese Habu

Protobothrops mucrosquamatus

Daily sighting probability ~40% · Likely

Central American Rattlesnake

Crotalus simus

Daily sighting probability ~40% · Likely

Asp Viper

Vipera aspis

Daily sighting probability ~40% · Likely

Eastern Copperhead

Agkistrodon contortrix

Daily sighting probability ~40% · Likely

Urutu Lancehead

Bothrops alternatus

Daily sighting probability ~40% · Likely

Chinese Green Tree Viper

Trimeresurus stejnegeri

Daily sighting probability ~40% · Likely

Wilson's Montane Pitviper

Cerrophidion wilsoni

Daily sighting probability ~40% · Likely

Large-scaled Pit Viper

Craspedocephalus macrolepis

Daily sighting probability ~40% · Likely

Seoane's Viper

Vipera seoanei

Daily sighting probability ~40% · Likely

Nose-horned Viper

Vipera ammodytes

Daily sighting probability ~40% · Likely

Siamese Russell's Viper

Daboia siamensis

Daily sighting probability ~40% · Likely

Rainforest Hog-nosed Viper

Porthidium nasutum

Daily sighting probability ~40% · Likely

Beautiful Pitviper

Trimeresurus venustus

Daily sighting probability ~30% · Possible

Great Lakes Bush Viper

Atheris nitschei

Daily sighting probability ~30% · Possible

Timber Rattlesnake

Crotalus horridus

Daily sighting probability ~30% · Possible

Malcolm’s Pitviper

Trimeresurus malcolmi

Daily sighting probability ~30% · Possible

Central American Jumping Pit Viper

Metlapilcoatlus mexicanus

Daily sighting probability ~30% · Possible

White-lipped Pit Viper

Trimeresurus albolabris

Daily sighting probability ~30% · Possible

Eastern Diamondback Rattlesnake

Crotalus adamanteus

Daily sighting probability ~30% · Possible

Horned Adder

Bitis caudalis

Daily sighting probability ~30% · Possible

Red Diamond Rattlesnake

Crotalus ruber

Daily sighting probability ~30% · Possible

Eastern Black-tailed Rattlesnake

Crotalus ornatus

Daily sighting probability ~30% · Possible

Anamala Pit Viper

Craspedocephalus anamallensis

Daily sighting probability ~30% · Possible

Brazilian Lancehead

Bothrops moojeni

Daily sighting probability ~30% · Possible

Yarará Lancehead

Bothrops jararaca

Daily sighting probability ~30% · Possible

Dusky Rattlesnake

Crotalus triseriatus

Daily sighting probability ~30% · Possible

Whitetail Lancehead

Bothrops leucurus

Daily sighting probability ~30% · Possible

Sumatra Pit Viper

Trimeresurus sumatranus

Daily sighting probability ~30% · Possible

Marbled lancehead

Bothrops marmoratus

Daily sighting probability ~20% · Possible

Lansberg's Hognose Viper

Porthidium lansbergii

Daily sighting probability ~20% · Possible

See all 60 species Show fewer

Showing the 60 most likely of 104 species — the park table below covers them all.

Daily sighting probability by month

Probability-weighted average across the group's species

~20%

Jan

~30%

Feb

~30%

Mar

~30%

Apr

~30%

May

~30%

Jun

~30%

Jul

~30%

Aug

~30%

Sep

~30%

Oct

~30%

Nov

~30%

Dec

When they're spotted

When the group's species are recorded (aggregated)

Where to see Vipers

Warmer areas are where this group is recorded most often. Shaded: the known ranges of its 209 species, darker where more of them overlap (GARD, Roll et al. 2017 & Caetano et al. 2022). Our parks Our cities In captivity: 286 zoos & centres

Parks Ranked

#	Park	Country	Species	Daily sighting probability
1	Sinharaja Forest Reserve	🇱🇰 Sri Lanka	3 of 104	~90%
	Ceylon Pit Viper			~80%
	Lowland Hump-nosed Viper			~50%
	Russell's Viper			~20%
2	Bako National Park	🇲🇾 Malaysia	1 of 104	~90%
	North Philippine Temple Pitviper			~90%
3	Kinabalu Park	🇲🇾 Malaysia	6 of 104	~90%
	North Philippine Temple Pitviper			~50%
	Sabah Bamboo Pitviper			~40%
	Malcolm’s Pitviper			~30%
	Sumatra Pit Viper			~30%
	Chasen’s Mountain Pitviper			~20%
	Borneo Pit Viper			~20%
4	Emas National Park	🇧🇷 Brazil	4 of 104	~90%
	Cerrado Lancehead			~50%
	Neotropical Rattlesnake			~50%
	Urutu Lancehead			~40%
	Brazilian Lancehead			~30%
5	Brownsberg Nature Park	🇸🇷 Suriname	2 of 104	~90%
	Barba Amarilla			~70%
	Green Jararaca			~50%
6	Gunung Leuser National Park	🇮🇩 Indonesia	5 of 104	~90%
	Wagler's Pit Viper			~70%
	Gunalen's Pitviper			~20%
	Sumatran Palm Pit Viper			~20%
	Hagen’s Pitviper			~20%
	Sabah Bamboo Pitviper			~20%
7	Big Cypress National Preserve	🇺🇸 United States	2 of 104	~80%
	Florida Cottonmouth			~80%
	Eastern Diamondback Rattlesnake			~30%
8	Sepilok	🇲🇾 Malaysia	2 of 104	~80%
	North Philippine Temple Pitviper			~80%
	Borneo Pit Viper			~20%
9	Congaree National Park	🇺🇸 United States	3 of 104	~80%
	Northern Cottonmouth			~60%
	Eastern Copperhead			~30%
	Timber Rattlesnake			~10%
10	Komodo National Park	🇮🇩 Indonesia	2 of 104	~80%
	White-lipped Island Pitviper			~60%
	Siamese Russell's Viper			~40%
11	Joshua Tree National Park	🇺🇸 United States	6 of 104	~70%
	Southwestern Speckled Rattlesnake			~50%
	Sidewinder			~20%
	Western Rattlesnake			~20%
	Mohave Rattlesnake			~10%
	Red Diamond Rattlesnake			~10%
	Western Diamondback Rattlesnake			~10%
12	Monteverde Cloud Forest Reserve	🇨🇷 Costa Rica	3 of 104	~70%
	Side-striped palm pit viper			~70%
	Fer-de-lance			~10%
	Black-speckled Palm Pit Viper			~10%
13	Saguaro National Park	🇺🇸 United States	6 of 104	~70%
	Western Diamondback Rattlesnake			~40%
	Western Black-tailed Rattlesnake			~20%
	Tiger Rattlesnake			~20%
	Arizona Black Rattlesnake			~10%
	Mohave Rattlesnake			~10%
	Sidewinder			~10%
14	Everglades National Park	🇺🇸 United States	3 of 104	~70%
	Florida Cottonmouth			~50%
	Eastern Diamondback Rattlesnake			~30%
	Pygmy Rattlesnake			~10%
15	Braulio Carrillo National Park	🇨🇷 Costa Rica	5 of 104	~70%
	Fer-de-lance			~60%
	Side-striped palm pit viper			~10%
	Black-speckled Palm Pit Viper			~10%
	Rainforest Hog-nosed Viper			~10%
	Picado's Pit Viper			~10%
16	Santa Rosa National Park	🇨🇷 Costa Rica	2 of 104	~70%
	Slender Hognose Viper			~50%
	Central American Rattlesnake			~40%
17	Big Bend National Park	🇺🇸 United States	4 of 104	~70%
	Western Diamondback Rattlesnake			~40%
	Eastern Black-tailed Rattlesnake			~30%
	Mohave Rattlesnake			~10%
	Rock Rattlesnake			~10%
18	Death Valley National Park	🇺🇸 United States	2 of 104	~70%
	Panamint Rattlesnake			~40%
	Sidewinder			~40%
19	Tenorio Volcano National Park	🇨🇷 Costa Rica	3 of 104	~70%
	Fer-de-lance			~50%
	Rainforest Hog-nosed Viper			~30%
	Central American Jumping Pit Viper			~20%
20	Cusuco National Park	🇭🇳 Honduras	3 of 104	~70%
	Wilson's Montane Pitviper			~40%
	Central American Jumping Pit Viper			~30%
	March's Palm Pit Viper			~20%
21	Khao Yai National Park	🇹🇭 Thailand	2 of 104	~70%
	Vogel’s Pit Viper			~60%
	Kramer's Pit Viper			~20%
22	El Triunfo	🇲🇽 Mexico	1 of 104	~70%
	Godman's Montane Pit Viper			~70%
23	Pico Bonito National Park	🇭🇳 Honduras	3 of 104	~70%
	Rainforest Hog-nosed Viper			~40%
	Fer-de-lance			~30%
	Central American Jumping Pit Viper			~30%
24	Khao Sok National Park	🇹🇭 Thailand	2 of 104	~70%
	Wagler's Pit Viper			~50%
	Sabah Bamboo Pitviper			~20%
25	Taï National Park	🇨🇮 Ivory Coast	1 of 104	~70%
	Green Bush Viper			~70%
26	Cuc Phuong National Park	🇻🇳 Vietnam	2 of 104	~60%
	Taiwanese Habu			~40%
	Chinese Green Tree Viper			~40%
27	Tanjung Puting National Park	🇮🇩 Indonesia	1 of 104	~60%
	North Philippine Temple Pitviper			~60%
28	Danum Valley Conservation Area	🇲🇾 Malaysia	2 of 104	~60%
	North Philippine Temple Pitviper			~60%
	Sumatra Pit Viper			~20%
29	Guadalupe Mountains National Park	🇺🇸 United States	3 of 104	~60%
	Western Diamondback Rattlesnake			~30%
	Eastern Black-tailed Rattlesnake			~30%
	Rock Rattlesnake			~20%
30	Piedras Blancas National Park	🇨🇷 Costa Rica	2 of 104	~60%
	Fer-de-lance			~50%
	White-tailed Hognose Viper			~20%
31	Arenal Volcano National Park	🇨🇷 Costa Rica	4 of 104	~60%
	Fer-de-lance			~40%
	Rainforest Hog-nosed Viper			~20%
	Central American Jumping Pit Viper			~20%
	Side-striped palm pit viper			~10%
32	Shenandoah National Park	🇺🇸 United States	2 of 104	~60%
	Eastern Copperhead			~40%
	Timber Rattlesnake			~30%
33	Triglav National Park	🇸🇮 Slovenia	2 of 104	~60%
	Adder			~40%
	Nose-horned Viper			~30%
34	Khao Luang National Park	🇹🇭 Thailand	2 of 104	~60%
	Sabah Bamboo Pitviper			~40%
	Beautiful Pitviper			~30%
35	Cat Tien National Park	🇻🇳 Vietnam	2 of 104	~60%
	Ruby-eyed Green Pitviper			~40%
	White-lipped Pit Viper			~20%
36	Badlands National Park	🇺🇸 United States	1 of 104	~50%
	Prairie Rattlesnake			~50%
37	De Hoop Nature Reserve	🇿🇦 South Africa	2 of 104	~50%
	Puff Adder			~40%
	Southern Adder			~20%
38	Chirripó National Park	🇨🇷 Costa Rica	4 of 104	~50%
	Side-striped palm pit viper			~20%
	Costa Rica Montane Pitviper			~20%
	Blotched Palm-pitviper			~10%
	Black-speckled Palm Pit Viper			~10%
39	El Vizcaíno Biosphere Reserve	🇲🇽 Mexico	3 of 104	~50%
	Red Diamond Rattlesnake			~30%
	Lower California Rattlesnake			~20%
	Speckled Rattlesnake			~10%
40	Great Smoky Mountains National Park	🇺🇸 United States	2 of 104	~50%
	Eastern Copperhead			~30%
	Timber Rattlesnake			~30%
41	Sundarbans National Park	🇮🇳 India	1 of 104	~50%
	Spot-tailed Pitviper			~50%
42	Tatra National Park	🇸🇰 Slovakia	1 of 104	~50%
	Adder			~50%
43	Tayrona National Natural Park	🇨🇴 Colombia	2 of 104	~50%
	Fer-de-lance			~30%
	Lansberg's Hognose Viper			~20%
44	Garden Route National Park	🇿🇦 South Africa	3 of 104	~50%
	Puff Adder			~20%
	Rhombic Night Adder			~20%
	Berg Adder			~10%
45	Península Valdés	🇦🇷 Argentina	1 of 104	~50%
	Patagonia Lancehead			~50%
46	West Coast National Park	🇿🇦 South Africa	1 of 104	~50%
	Puff Adder			~50%
47	Namib-Naukluft National Park	🇳🇦 Namibia	2 of 104	~50%
	Horned Adder			~30%
	Peringuey's Adder			~20%
48	El Impenetrable National Park	🇦🇷 Argentina	1 of 104	~50%
	Painted Lancehead			~50%
49	Gandoca-Manzanillo Wildlife Refuge	🇨🇷 Costa Rica	3 of 104	~50%
	Fer-de-lance			~20%
	Rainforest Hog-nosed Viper			~20%
	Central American Bushmaster			~10%
50	Manu National Park	🇵🇪 Peru	4 of 104	~50%
	Barba Amarilla			~30%
	Green Jararaca			~10%
	Brazil's Lancehead			~10%
	Atlantic Forest Bushmaster			~10%
51	Serra da Canastra National Park	🇧🇷 Brazil	2 of 104	~50%
	Neotropical Rattlesnake			~30%
	Marbled lancehead			~20%
52	Sequoia and Kings Canyon National Parks	🇺🇸 United States	1 of 104	~40%
	Western Rattlesnake			~40%
53	Corcovado National Park	🇨🇷 Costa Rica	1 of 104	~40%
	Fer-de-lance			~40%
54	Manuel Antonio National Park	🇨🇷 Costa Rica	1 of 104	~40%
	Fer-de-lance			~40%
55	Utría National Natural Park	🇨🇴 Colombia	1 of 104	~40%
	Fer-de-lance			~40%
56	Chapada Diamantina National Park	🇧🇷 Brazil	2 of 104	~40%
	Whitetail Lancehead			~30%
	Neotropical Rattlesnake			~20%
57	Pyrénées National Park	🇫🇷 France	2 of 104	~40%
	Asp Viper			~30%
	Seoane's Viper			~20%
58	Serra dos Órgãos National Park	🇧🇷 Brazil	2 of 104	~40%
	Yarará Lancehead			~30%
	Jararacussu			~20%
59	Iguazú National Park	🇦🇷 Argentina	4 of 104	~40%
	Brazilian Lancehead			~20%
	Neotropical Rattlesnake			~10%
	Jararacussu			~10%
	Painted Lancehead			~10%
60	Darién National Park	🇵🇦 Panama	2 of 104	~40%
	Fer-de-lance			~20%
	Rainforest Hog-nosed Viper			~20%
61	Aigüestortes National Park	🇪🇸 Spain	1 of 104	~40%
	Asp Viper			~40%
62	Snowdonia National Park	🇬🇧 United Kingdom	1 of 104	~40%
	Adder			~40%
63	La Tigra National Park	🇭🇳 Honduras	1 of 104	~40%
	Wilson's Montane Pitviper			~40%
64	Taroko National Park	🇹🇼 Taiwan	3 of 104	~40%
	Chinese Green Tree Viper			~20%
	Kikuchi Habu			~10%
	Taiwanese Habu			~10%
65	Tambopata National Reserve	🇵🇪 Peru	3 of 104	~40%
	Atlantic Forest Bushmaster			~20%
	Green Jararaca			~10%
	Barba Amarilla			~10%
66	Eravikulam National Park	🇮🇳 India	1 of 104	~40%
	Large-scaled Pit Viper			~40%
67	Iguaçu National Park	🇧🇷 Brazil	4 of 104	~40%
	Brazilian Lancehead			~20%
	Neotropical Rattlesnake			~10%
	Painted Lancehead			~10%
	Jararacussu			~10%
68	Picos de Europa National Park	🇪🇸 Spain	1 of 104	~40%
	Seoane's Viper			~40%
69	Chagres National Park	🇵🇦 Panama	1 of 104	~40%
	Fer-de-lance			~40%
70	Plitvice Lakes National Park	🇭🇷 Croatia	1 of 104	~40%
	Nose-horned Viper			~40%
71	Cairngorms National Park	🇬🇧 United Kingdom	1 of 104	~40%
	Adder			~40%
72	Cockscomb Basin Wildlife Sanctuary	🇧🇿 Belize	1 of 104	~40%
	Fer-de-lance			~40%
73	Nyungwe National Park	🇷🇼 Rwanda	1 of 104	~30%
	Great Lakes Bush Viper			~30%
74	Hohe Tauern National Park	🇦🇹 Austria	1 of 104	~30%
	Adder			~30%
75	Zion National Park	🇺🇸 United States	1 of 104	~30%
	Western Rattlesnake			~30%
76	Yosemite National Park	🇺🇸 United States	1 of 104	~30%
	Western Rattlesnake			~30%
77	Kaeng Krachan National Park	🇹🇭 Thailand	1 of 104	~30%
	White-lipped Pit Viper			~30%
78	Taman Negara National Park	🇲🇾 Malaysia	1 of 104	~30%
	Wagler's Pit Viper			~30%
79	Periyar National Park	🇮🇳 India	1 of 104	~30%
	Anamala Pit Viper			~30%
80	Mercantour National Park	🇫🇷 France	1 of 104	~30%
	Asp Viper			~30%
81	La Amistad International Park (Panama)	🇵🇦 Panama	4 of 104	~30%
	Fer-de-lance			~10%
	Black-speckled Palm Pit Viper			~10%
	Side-striped palm pit viper			~10%
	Costa Rica Montane Pitviper			<5%
82	Cumbres de Monterrey National Park	🇲🇽 Mexico	6 of 104	~30%
	Tamaulipan Rock Rattlesnake			~10%
	Eastern Black-tailed Rattlesnake			~10%
	Totonacan Rattlesnake			~10%
	Rock Rattlesnake			~10%
	Western Diamondback Rattlesnake			<5%
	Western Black-tailed Rattlesnake			<5%
83	Bavarian Forest National Park	🇩🇪 Germany	1 of 104	~30%
	Adder			~30%
84	Cahuita National Park	🇨🇷 Costa Rica	2 of 104	~30%
	Fer-de-lance			~20%
	Rainforest Hog-nosed Viper			~10%
85	Soberanía National Park	🇵🇦 Panama	1 of 104	~30%
	Fer-de-lance			~30%
86	Grand Canyon National Park	🇺🇸 United States	1 of 104	~30%
	Western Rattlesnake			~30%
87	Vanoise National Park	🇫🇷 France	1 of 104	~30%
	Asp Viper			~30%
88	Calakmul Biosphere Reserve	🇲🇽 Mexico	2 of 104	~30%
	Yucatán Neotropical Rattlesnake			~20%
	Fer-de-lance			~10%
89	Reserva de la Biosfera Mariposa Monarca	🇲🇽 Mexico	1 of 104	~30%
	Dusky Rattlesnake			~30%
90	El Palmar National Park	🇦🇷 Argentina	1 of 104	~30%
	Urutu Lancehead			~30%
91	Podocarpus National Park	🇪🇨 Ecuador	2 of 104	~30%
	Barba Amarilla			~20%
	Lojan Lancehead			~10%
92	Tsavo East National Park	🇰🇪 Kenya	1 of 104	~30%
	Puff Adder			~30%
93	Celaque National Park	🇭🇳 Honduras	1 of 104	~30%
	Central American Rattlesnake			~30%
94	Bali Barat National Park	🇮🇩 Indonesia	1 of 104	~30%
	White-lipped Island Pitviper			~30%
95	Yasuní National Park	🇪🇨 Ecuador	2 of 104	~20%
	Barba Amarilla			~20%
	Green Jararaca			~10%
96	Henri Pittier National Park	🇻🇪 Venezuela	1 of 104	~20%
	Barba Amarilla			~20%
97	Table Mountain National Park	🇿🇦 South Africa	2 of 104	~20%
	Puff Adder			~20%
	Berg Adder			~10%
98	Carara National Park	🇨🇷 Costa Rica	1 of 104	~20%
	Fer-de-lance			~20%
99	Tikal National Park	🇬🇹 Guatemala	1 of 104	~20%
	Fer-de-lance			~20%
100	Itatiaia National Park	🇧🇷 Brazil	1 of 104	~20%
	Yarará Lancehead			~20%
101	Volcán Barú National Park	🇵🇦 Panama	1 of 104	~20%
	Black-speckled Palm Pit Viper			~20%
102	Kanha National Park	🇮🇳 India	1 of 104	~20%
	Common Bamboo Viper			~20%
103	Farallones de Cali National Natural Park	🇨🇴 Colombia	2 of 104	~20%
	Highland Eyelash-Pitviper			~10%
	Fer-de-lance			~10%
104	Tapantí-Macizo de la Muerte National Park	🇨🇷 Costa Rica	3 of 104	~20%
	Fer-de-lance			~10%
	Side-striped palm pit viper			~10%
	Black-speckled Palm Pit Viper			~10%
105	Cabo Pulmo National Park	🇲🇽 Mexico	1 of 104	~20%
	Red Diamond Rattlesnake			~20%
106	Kgalagadi Transfrontier Park	🇿🇦 South Africa	1 of 104	~20%
	Puff Adder			~20%
107	Cévennes National Park	🇫🇷 France	2 of 104	~20%
	Asp Viper			~20%
	Adder			~10%
108	Kruger National Park	🇿🇦 South Africa	2 of 104	~20%
	Puff Adder			~20%
	Snouted Night Adder			~10%
109	Tortuguero National Park	🇨🇷 Costa Rica	1 of 104	~20%
	Fer-de-lance			~20%
110	Bahía de Loreto National Park	🇲🇽 Mexico	2 of 104	~20%
	Red Diamond Rattlesnake			~10%
	Santa Catalina Island Rattlesnake			~10%
111	uMkhuze Game Reserve	🇿🇦 South Africa	1 of 104	~20%
	Puff Adder			~20%
112	Iberá National Park	🇦🇷 Argentina	1 of 104	~20%
	Urutu Lancehead			~20%
113	Addo Elephant National Park	🇿🇦 South Africa	2 of 104	~20%
	Puff Adder			~10%
	Rhombic Night Adder			~10%
114	Ecrins National Park	🇫🇷 France	1 of 104	~20%
	Asp Viper			~20%
115	Ostional Wildlife Refuge	🇨🇷 Costa Rica	1 of 104	~20%
	Central American Rattlesnake			~20%
116	Gorongosa National Park	🇲🇿 Mozambique	1 of 104	~20%
	Snouted Night Adder			~20%
117	Bwindi Impenetrable National Park	🇺🇬 Uganda	1 of 104	~20%
	Great Lakes Bush Viper			~20%
118	Palo Verde National Park	🇨🇷 Costa Rica	1 of 104	~20%
	Slender Hognose Viper			~20%
119	Rincón de la Vieja National Park	🇨🇷 Costa Rica	1 of 104	~20%
	Fer-de-lance			~20%
120	Doi Inthanon National Park	🇹🇭 Thailand	1 of 104	~20%
	Chinese Mountain Pit Viper			~20%
121	Merritt Island National Wildlife Refuge	🇺🇸 United States	2 of 104	~20%
	Eastern Diamondback Rattlesnake			~10%
	Pygmy Rattlesnake			~10%
122	Ordesa y Monte Perdido National Park	🇪🇸 Spain	1 of 104	~20%
	Asp Viper			~20%
123	Bastimentos Island National Marine Park	🇵🇦 Panama	1 of 104	~20%
	Fer-de-lance			~20%
124	Minneriya National Park	🇱🇰 Sri Lanka	1 of 104	~20%
	Hump-nosed Viper			~20%
125	Tijuca National Park	🇧🇷 Brazil	2 of 104	~20%
	Yarará Lancehead			~10%
	Jararacussu			~10%
126	Poás Volcano National Park	🇨🇷 Costa Rica	1 of 104	~10%
	Side-striped palm pit viper			~10%
127	Los Quetzales National Park	🇨🇷 Costa Rica	1 of 104	~10%
	Talamancan Palm Pit Viper			~10%
128	iSimangaliso Wetland Park	🇿🇦 South Africa	2 of 104	~10%
	Puff Adder			~10%
	Gaboon Adder			~10%
129	Marino Ballena National Park	🇨🇷 Costa Rica	1 of 104	~10%
	Fer-de-lance			~10%
130	Nairobi National Park	🇰🇪 Kenya	1 of 104	~10%
	Puff Adder			~10%
131	Padre Island National Seashore	🇺🇸 United States	1 of 104	~10%
	Western Diamondback Rattlesnake			~10%
132	Aberdare National Park	🇰🇪 Kenya	1 of 104	~10%
	Kenya Montane Viper			~10%
133	Kinabatangan Wildlife Sanctuary	🇲🇾 Malaysia	1 of 104	~10%
	North Philippine Temple Pitviper			~10%
134	Serengeti National Park	🇹🇿 Tanzania	1 of 104	~10%
	Puff Adder			~10%
135	Sian Ka'an Biosphere Reserve	🇲🇽 Mexico	1 of 104	~10%
	Fer-de-lance			~10%
136	Pilanesberg National Park	🇿🇦 South Africa	1 of 104	~10%
	Puff Adder			~10%
137	Los Nevados National Natural Park	🇨🇴 Colombia	1 of 104	~10%
	Highland Eyelash-Pitviper			~10%
138	Sierra de Guadarrama National Park	🇪🇸 Spain	1 of 104	~10%
	Lataste's Viper			~10%
139	Masai Mara National Reserve	🇰🇪 Kenya	1 of 104	~10%
	Puff Adder			~10%
140	Wadden Sea National Park	🇩🇪 Germany	1 of 104	~10%
	Adder			~10%
141	Etosha National Park	🇳🇦 Namibia	1 of 104	~10%
	Puff Adder			~10%
142	Parque Natural Metropolitano	🇵🇦 Panama	1 of 104	~10%
	Fer-de-lance			~10%
143	Yellowstone National Park	🇺🇸 United States	1 of 104	<5%
	Prairie Rattlesnake			<5%

Cities Ranked

#	City	Country	Species	Daily sighting probability
1	Jakarta	🇮🇩 Indonesia	1 of 104	~50%
	White-lipped Pit Viper			~50%
2	Denpasar	🇮🇩 Indonesia	1 of 104	~40%
	White-lipped Island Pitviper			~40%
3	Taipei	🇹🇼 Taiwan	2 of 104	~40%
	Taiwanese Habu			~20%
	Chinese Green Tree Viper			~20%
4	Bangkok	🇹🇭 Thailand	2 of 104	~30%
	Kramer's Pit Viper			~30%
	White-lipped Pit Viper			~10%
5	Manaus	🇧🇷 Brazil	1 of 104	~30%
	Barba Amarilla			~30%
6	Hong Kong	🇨🇳 China	1 of 104	~30%
	White-lipped Pit Viper			~30%
7	Chandigarh	🇮🇳 India	1 of 104	~30%
	Russell's Viper			~30%
8	Taichung	🇹🇼 Taiwan	2 of 104	~30%
	Taiwanese Habu			~20%
	Chinese Green Tree Viper			~10%
9	Mesa	🇺🇸 United States	4 of 104	~30%
	Southwestern Speckled Rattlesnake			~10%
	Western Diamondback Rattlesnake			~10%
	Western Black-tailed Rattlesnake			~10%
	Tiger Rattlesnake			<5%
10	Singapore	🇸🇬 Singapore	1 of 104	~30%
	Wagler's Pit Viper			~30%
11	Fuzhou	🇨🇳 China	1 of 104	~30%
	White-lipped Pit Viper			~30%
12	Coimbatore	🇮🇳 India	1 of 104	~30%
	Russell's Viper			~30%
13	Kaohsiung	🇹🇼 Taiwan	2 of 104	~30%
	Chinese Green Tree Viper			~20%
	Taiwanese Habu			~10%
14	Toluca	🇲🇽 México	1 of 104	~20%
	Dusky Rattlesnake			~20%
15	Buenos Aires	🇦🇷 Argentina	1 of 104	~20%
	Urutu Lancehead			~20%
16	Guangzhou	🇨🇳 China	1 of 104	~20%
	White-lipped Pit Viper			~20%
17	Salvador	🇧🇷 Brazil	1 of 104	~20%
	Whitetail Lancehead			~20%
18	Colombo [Sri Jayawardenepura Kotte]	🇱🇰 Sri Lanka	2 of 104	~20%
	Russell's Viper			~10%
	Hump-nosed Viper			~10%
19	Pune	🇮🇳 India	1 of 104	~20%
	Russell's Viper			~20%
20	Phoenix	🇺🇸 United States	3 of 104	~20%
	Southwestern Speckled Rattlesnake			~10%
	Western Diamondback Rattlesnake			~10%
	Tiger Rattlesnake			<5%
21	Ho Chi Minh City	🇻🇳 Vietnam	1 of 104	~20%
	White-lipped Pit Viper			~20%
22	San Diego	🇺🇸 United States	2 of 104	~20%
	Western Rattlesnake			~10%
	Red Diamond Rattlesnake			~10%
23	Bengaluru	🇮🇳 India	1 of 104	~20%
	Russell's Viper			~20%
24	Sacramento	🇺🇸 United States	1 of 104	~20%
	Western Rattlesnake			~20%
25	Kollam	🇮🇳 India	1 of 104	~20%
	Russell's Viper			~20%
26	Mumbai	🇮🇳 India	2 of 104	~20%
	Common Bamboo Viper			~10%
	Russell's Viper			~10%
27	Kochi	🇮🇳 India	1 of 104	~10%
	Russell's Viper			~10%
28	Tijuana	🇲🇽 México	1 of 104	~10%
	Western Rattlesnake			~10%
29	Kuala Lumpur	🇲🇾 Malaysia	1 of 104	~10%
	Wagler's Pit Viper			~10%
30	Hangzhou	🇨🇳 China	1 of 104	~10%
	Chinese Green Tree Viper			~10%
31	Rio de Janeiro	🇧🇷 Brazil	2 of 104	~10%
	Yarará Lancehead			~10%
	Jararacussu			<5%
32	Houston	🇺🇸 United States	2 of 104	~10%
	Eastern Copperhead			~10%
	Northern Cottonmouth			~10%
33	Guatemala City	🇬🇹 Guatemala	1 of 104	~10%
	Godman's Montane Pit Viper			~10%
34	Mexico City	🇲🇽 México	2 of 104	~10%
	Western Black-tailed Rattlesnake			~10%
	Dusky Rattlesnake			<5%
35	Cordoba	🇦🇷 Argentina	1 of 104	~10%
	Painted Lancehead			~10%
36	Tuen Mun	🇨🇳 China	1 of 104	~10%
	White-lipped Pit Viper			~10%
37	Los Angeles	🇺🇸 United States	2 of 104	~10%
	Western Rattlesnake			~10%
	Red Diamond Rattlesnake			<5%
38	Cape Town	🇿🇦 South Africa	1 of 104	~10%
	Puff Adder			~10%
39	Hyderabad	🇮🇳 India	1 of 104	~10%
	Russell's Viper			~10%
40	Porto Alegre	🇧🇷 Brazil	1 of 104	~10%
	Yarará Lancehead			~10%
41	Stockholm	🇸🇪 Sweden	1 of 104	~10%
	Adder			~10%
42	Dallas	🇺🇸 United States	1 of 104	~10%
	Eastern Copperhead			~10%
43	Washington	🇺🇸 United States	1 of 104	~10%
	Eastern Copperhead			~10%
44	São Paulo	🇧🇷 Brazil	1 of 104	~10%
	Yarará Lancehead			~10%
45	Panama City	🇵🇦 Panama	1 of 104	~10%
	Fer-de-lance			~10%
46	Austin	🇺🇸 United States	1 of 104	~10%
	Western Diamondback Rattlesnake			~10%
47	Salt Lake City	🇺🇸 United States	1 of 104	~10%
	Western Rattlesnake			~10%
48	San José	🇨🇷 Costa Rica	1 of 104	~10%
	Side-striped palm pit viper			~10%
49	Denver	🇺🇸 United States	1 of 104	~10%
	Prairie Rattlesnake			~10%
50	Orlando	🇺🇸 United States	1 of 104	<5%
	Florida Cottonmouth			<5%
51	London	🇬🇧 United Kingdom	1 of 104	<5%
	Adder			<5%
52	San Antonio	🇺🇸 United States	1 of 104	<5%
	Western Diamondback Rattlesnake			<5%
53	Monterrey	🇲🇽 México	1 of 104	<5%
	Western Diamondback Rattlesnake			<5%
54	Miami	🇺🇸 United States	1 of 104	<5%
	Florida Cottonmouth			<5%
55	San Francisco	🇺🇸 United States	1 of 104	<5%
	Western Rattlesnake			<5%

Zoos & Centres Where Found

#	Zoo / Centre	Country
1	Disney's Animal Kingdom	🇺🇸 United States	In captivity
2	Busch Gardens Tampa	🇺🇸 United States	In captivity
3	San Diego Zoo	🇺🇸 United States	In captivity
4	Moscow Zoo	🇷🇺 Russia	In captivity
5	Prague Zoo	🇨🇿 Czechia	In captivity
6	National Zoological Park	🇺🇸 United States	In captivity
7	Yangon Zoological Gardens	🇲🇲 Myanmar (Burma)	In captivity
8	Leipzig Zoological Garden	🇩🇪 Germany	In captivity
9	Denver Zoo	🇺🇸 United States	In captivity
10	Skansen	🇸🇪 Sweden	In captivity
11	Cincinnati Zoo and Botanical Garden	🇺🇸 United States	In captivity
12	California Academy of Sciences	🇺🇸 United States	In captivity
13	Antwerp Zoo	🇧🇪 Belgium	In captivity
14	Barcelona Zoo	🇪🇸 Spain	In captivity
15	North Carolina Zoo	🇺🇸 United States	In captivity
16	Australia Zoo	🇦🇺 Australia	In captivity
17	Cabarceno Natural Park	🇪🇸 Spain	In captivity
18	Ostrava Zoo	🇨🇿 Czechia	In captivity
19	Paris Zoological Park	🇫🇷 France	In captivity
20	Zoo Pilsen	🇨🇿 Czechia	In captivity
21	Réserve africaine de Sigean	🇫🇷 France	In captivity
22	Greensboro Science Center	🇺🇸 United States	In captivity
23	Chomutov Zoo	🇨🇿 Czechia	In captivity
24	Abilene Zoological Gardens	🇺🇸 United States	In captivity
25	Zoobotanic Park of Brusque	🇧🇷 Brazil	In captivity
26	Nandankanan Zoological Park	🇮🇳 India	In captivity
27	Zoo Miami	🇺🇸 United States	In captivity
28	Lion Country Safari	🇺🇸 United States	In captivity
29	Toronto Zoo	🇨🇦 Canada	In captivity
30	Indroda Nature Park	🇮🇳 India	In captivity
31	Living Desert Zoo and Gardens	🇺🇸 United States	In captivity
32	Nehru Zoological Park	🇮🇳 India	In captivity
33	Columbus Zoo and Aquarium	🇺🇸 United States	In captivity
34	Bronx Zoo	🇺🇸 United States	In captivity
35	Yumka'	🇲🇽 Mexico	In captivity
36	Kadoorie Farm and Botanic Garden	🇭🇰 Hong Kong SAR China	In captivity
37	Zoological Garden of Belo Horizonte	🇧🇷 Brazil	In captivity
38	Zoológico de Brasília	🇧🇷 Brazil	In captivity
39	Parque Zoobotânico de Teresina	🇧🇷 Brazil	In captivity
40	Baton Rouge Zoo	🇺🇸 United States	In captivity
41	Ecological Center of Sonora	🇲🇽 Mexico	In captivity
42	Parc zoologique de Montpellier	🇫🇷 France	In captivity
43	Nashville Zoo at Grassmere	🇺🇸 United States	In captivity
44	Sedgwick County Zoo	🇺🇸 United States	In captivity
45	Omaha’s Henry Doorly Zoo and Aquarium	🇺🇸 United States	In captivity
46	Chester Zoo	🇬🇧 United Kingdom	In captivity
47	Milwaukee County Zoo	🇺🇸 United States	In captivity
48	Johannesburg Zoo	🇿🇦 South Africa	In captivity
49	Los Angeles Zoo	🇺🇸 United States	In captivity
50	Rajiv Gandhi Zoological Park	🇮🇳 India	In captivity

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