Western Narrow-mouthed Toad

Western Narrow-mouthed Toad

Gastrophryne olivacea

Silhouette: Dmitry Bogdanov (vectorized by T. Michael Keesey) · PhyloPic

Least ConcernNear ThreatenedVulnerableEndangeredCritically Endangered
Daily sighting probability ~10% · With luck
at Big Bend National Park
11 Verified sightings at Big Bend National Park From 2019 to 2026
11 Verified sightings across 1 park From 2019 to 2026
June Best month highest sighting rate
🌙 Nocturnal When it's spotted during nighttime hours (6pm–6am)

About the Western Narrow-mouthed Toad

Gastrophryne olivacea, the Great Plains narrow-mouthed toad or western narrow-mouthed toad, is a species of microhylid frog found throughout much of the south-central United States from Nebraska south through Texas, and into northern Mexico. Though not a true toad, evidenced by the smooth, moist skin, its common name is due to its terrestrial habit.

Great Plains narrow-mouthed toads are a small (19-42 mm snout to vent), fossorial, flat-bodied species, with a sharply pointed snout. They are typically olive green to grey-brown in color, sometimes with black blotching. Their undersides are lighter colored. Their skin secretions can cause severe, burning pain if they get into the eyes.

This toad is found in a wide range of habitats, but most frequently on moist ground or in leaf litter, and under rocks or fallen logs. They breed throughout the spring and summer in pools of water left by rainfall. They have been found to hybridize with Gastrophyrne carolinensis. Their primary diet is ants.

Western narrow-mouthed toads have a mutualistic relationship with tarantulas. They will live together, and in exchange will eat ants that attempt to invade... Wikipedia →

Global Distribution

Warmer areas are where this animal is recorded most often.

Parks Where Found

# Park Country Daily sighting probability
1 Big Bend National Park 🇺🇸 United States
~10%

More parks will be added in future updates.

Quick answers

What are the chances of seeing a Western Narrow-mouthed Toad in Big Bend National Park?

About 10% of wildlife watchers report a Western Narrow-mouthed Toad sighting in Big Bend National Park, based on 11 verified sightings from GBIF citizen-science data.

When is the best time to see Western Narrow-mouthed Toad in Big Bend National Park?

June has the highest sighting rate for Western Narrow-mouthed Toad in Big Bend National Park in our monthly data.

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