The largest frog in North America
Bullfrogs are green to brown with a large round eardrum behind the eye. They spend most of their lives in or near still water.
A chorus on summer evenings
Male bullfrogs call with a deep, droning “jug-o-rum” that carries across ponds at night. The sound helps females find mates and keeps males spaced out. Vocal sacs act as resonators that amplify the call.
An invasive species
Outside their native range the bullfrog is a problem. They eat native amphibians and can carry a fungus that harms other frog species, so they should never be released into the wild.
Listen
What it sounds like: A deep “jug-o-rum” call.
To hear independent recordings, try Freesound. Check each recording’s licence before reusing it. See Media & Sources.
Further reading: The Loudest Animals on Earth and Why They Are So Loud
Conservation status follows the IUCN Red List as we understand it at the time of writing. Assessments are revised regularly, so please check the IUCN Red List for the current listing.