Rhynchonycteris naso
Silhouette: Roberto Díaz Sibaja · PhyloPic
In 3 days ~50% in a week ~80%
The proboscis bat (Rhynchonycteris naso) is a species of bat found in South America and Central America. Other common names include long-nosed proboscis bat, sharp-nosed bat, Brazilian long-nosed bat, and river bat. It is the only species in the genus Rhynchonycteris.
This species is in the family Emballonuridae, the sac-winged or sheath-tailed bats. Like most bats, it is nocturnal. It is found from southern Mexico to Belize, Peru, Venezuela, Bolivia and Brazil, as well as in Trinidad.
This is a small bat, with a head-and-body length of 37–43 mm (1.5–1.7 in), a tail length of around 12 mm (0.47 in), and a forearm length of 35–41 mm (1.4–1.6 in). A sample of males and females from Trinidad found weights ranging between 2.1–4.3 g (0.074–0.152 oz). Males in northern South America were found to average 56 millimetres (2.2 in) long, females 59 millimetres (2.3 in). The tail is about 16 millimetres (0.63 in) long. Pregnant females can weigh up to 6 grams (0.21 oz).
This species is found in the lowlands of the northern half of South America, throughout Central America, and into southeastern Mexico. From Ecuador south, it is limited to east of the Andes... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Parque Estadual Encontro das Águas | 🇧🇷 Brazil | |
| 2 | Palo Verde National Park | 🇨🇷 Costa Rica | |
| 3 | Cuyabeno Wildlife Reserve | 🇪🇨 Ecuador | |
| 4 | Caroni Swamp | 🇹🇹 Trinidad and Tobago | |
| 5 | Tortuguero National Park | 🇨🇷 Costa Rica | |
| 6 | Yasuní National Park | 🇪🇨 Ecuador | |
| 7 | Montes Azules Biosphere Reserve | 🇲🇽 Mexico | |
| 8 | Braulio Carrillo National Park | 🇨🇷 Costa Rica | |
| 9 | Soberanía National Park | 🇵🇦 Panama | |
| 10 | Tambopata National Reserve | 🇵🇪 Peru | |
| 11 | Cahuita National Park | 🇨🇷 Costa Rica | |
| 12 | Manu National Park | 🇵🇪 Peru | |
| 13 | Manuel Antonio National Park | 🇨🇷 Costa Rica | |
| 14 | Biotopo Cerro Cahuí | 🇬🇹 Guatemala | |
| 15 | Lago de Yojoa | 🇭🇳 Honduras | |
| 16 | Gandoca-Manzanillo Wildlife Refuge | 🇨🇷 Costa Rica | |
| 17 | Las Baulas Marine National Park | 🇨🇷 Costa Rica | |
| 18 | Piedras Blancas National Park | 🇨🇷 Costa Rica | |
| 19 | Corcovado National Park | 🇨🇷 Costa Rica | |
| 20 | Carara National Park | 🇨🇷 Costa Rica | |
| 21 | Arenal Volcano National Park | 🇨🇷 Costa Rica | |
| 22 | La Amistad International Park (Panama) | 🇵🇦 Panama |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Belém | 🇧🇷 Brazil | |
| 2 | João Pessoa | 🇧🇷 Brazil | |
| 3 | Recife | 🇧🇷 Brazil |
Possible
About 20% of wildlife watchers report a Proboscis Bat sighting in Manuel Antonio National Park on a given day, based on 37 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 12th most-seen of the 18 mammals we can rate there. Over three days the chance rises to about 50%, and over a week to about 80%, if each day is a fresh chance.
May
In that month about 40% of wildlife watchers report a Proboscis Bat in Manuel Antonio National Park on a given day, against under 5% in August to December, the lowest months.
Between 9 am and noon
Across all the parks we cover, that three-hour window holds the most Proboscis Bat sightings with a recorded time, and about 8 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
13th of 22
Of the 22 parks where we can rate Proboscis Bat sightings, Manuel Antonio National Park ranks 13th at about 20%. The best odds are in Parque Estadual Encontro das Águas (Brazil, about 60%), Palo Verde National Park (Costa Rica, about 60%) and Cuyabeno Wildlife Reserve (Ecuador, about 50%). All parks ranked.
GBIF citizen-science records
It is estimated from how often the Proboscis Bat is recorded against all the mammals logged in Manuel Antonio National Park (37 verified sightings from 2019 to 2026), calibrated against known sighting rates. Figures are rounded to the nearest 10% because citizen-science data supports honest approximations, not decimals, and months with records from fewer than five people show "—". How it works.
