Aspidoscelis uniparens
Silhouette: Jose Carlos Arenas-Monroy · PhyloPic
In 3 days ~20% in a week ~50%
The desert grassland whiptail lizard (Aspidoscelis uniparens) is an all-female species of reptiles in North America. It was formerly placed in the genus Cnemidophorus. A common predator of the whiptail lizard is the leopard lizard that preys on A. uniparens by using ambush and stalk hunting tactics. These reptiles reproduce by parthenogenesis. In this process, eggs undergo a chromosome doubling after meiosis, developing into lizards without being fertilized. However, ovulation is enhanced by female-female courtship and mating (pseudo-copulation) rituals that resemble the behavior of closely related species that reproduce sexually.
The desert grassland whiptail lizard is a relatively small reptile, whose size ranges from 2+3⁄4 to 5+1⁄4 inches (7.0 to 13.3 cm). Desert grassland whiptails are very long and slim, with a thin tail that is longer than their body length. Their distinct identifying feature are the six yellowish lines that run the length of their body. The majority of the whiptail's body tends to be an olive or brown colour that fades to a faint blue or gray on their tail. Comparatively, an adolescent's tail is a very bright and vibrant blue. Their bodies... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Saguaro National Park | 🇺🇸 United States |
More parks will be added in future updates.
| # | Zoo / Centre | Country | |
|---|---|---|---|
| 1 | Toronto Zoo | 🇨🇦 Canada | |
| 2 | Columbus Zoo and Aquarium | 🇺🇸 United States | |
| 3 | ZooAmerica | 🇺🇸 United States |
With luck
About 10% of wildlife watchers report a Desert Grassland Whiptail sighting in Saguaro National Park on a given day, based on 29 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 34th most-seen of the 51 reptiles we can rate there. Over three days the chance rises to about 20%, and over a week to about 50%, if each day is a fresh chance.
September
In that month about 20% of wildlife watchers report a Desert Grassland Whiptail in Saguaro National Park on a given day, against under 5% in July and November–February, the lowest months. That is one of Saguaro National Park's wettest months, with about 50 mm of rain against almost none in May.
Between 9 am and noon
Across all the parks we cover, that three-hour window holds the most Desert Grassland Whiptail sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Only Saguaro National Park, in our data
Saguaro National Park is the only park on Wallace's Line with enough records to rate Desert Grassland Whiptail sightings: about 10% of wildlife watchers there report one on a given day.
Same genus: Aspidoscelis
The closest relatives of the Desert Grassland Whiptail that you can see in Saguaro National Park (genus Aspidoscelis, Northern Whiptails) are Western Whiptail (about 30%) and Sonoran Spotted Whiptail (about 20%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Desert Grassland Whiptail is recorded against all the reptiles logged in Saguaro National Park (29 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.
