Rana boylii
Silhouette: Sharp Photography, sharpphotography.co.uk · PhyloPic
In 3 days ~80% in a week >90%
The foothill yellow-legged frog (Rana boylii) is a small-sized (3.72–8.2 cm or 1.46–3.23 in) frog from the genus Rana in the family Ranidae. This species was historically found in the Coast Ranges from northern Oregon, through California, and into Baja California, Mexico as well as in the foothills of the Sierra Nevada and southern Cascade Range in California. The foothill yellow-legged frog is a Federal Species of Concern and California State Endangered. A federal rule to list four out of six extant distinct population segments (DPS) under the Endangered Species Act was proposed in December 2021.
The foothill yellow-legged frog has a grey, brown, or reddish dorsum, or the back of the frog. It is commonly spotted or mottled, but occasionally is plainly colored. Adults have yellow coloration under their legs, which may extend to their abdomens, but this characteristic is faint or absent in young frogs.
A triangular, buff-colored patch occurs on the snout, and, unlike other frogs in the genus, there is no eye stripe. The throat and chest are often boldly mottled; and the species has indistinct dorsolateral skin folds and granular skin. Males of this species develop... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Redwood National Park | 🇺🇸 United States |
More parks will be added in future updates.
| # | Zoo / Centre | Country | |
|---|---|---|---|
| 1 | Monterey Bay Aquarium | 🇺🇸 United States |
Likely
About 40% of wildlife watchers report a Foothill Yellow-legged Frog sighting in Redwood National Park on a given day, based on 657 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 6th most-seen of the 14 amphibians we can rate there. Over three days the chance rises to about 80%, and over a week to over 90%, if each day is a fresh chance.
March, May–August and October
In those months about 50% of wildlife watchers report a Foothill Yellow-legged Frog in Redwood National Park on a given day, against under 5% in December, the lowest month. Those are among Redwood National Park's driest months, with about 90 mm of rain a month against 360 mm in January.
Between 11 am and 2 pm
Across all the parks we cover, that three-hour window holds the most Foothill Yellow-legged Frog 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 Redwood National Park, in our data
Redwood National Park is the only park on Wallace's Line with enough records to rate Foothill Yellow-legged Frog sightings: about 40% of wildlife watchers there report one on a given day.
GBIF citizen-science records
It is estimated from how often the Foothill Yellow-legged Frog is recorded against all the amphibians logged in Redwood National Park (657 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.
