Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock () or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Audio of American Bullfrog (Lithobates catebeianus) call recorded by USGS in 2022, trimmed in Audacity software and set to animated waveform.
Public Domain.