What is Brimley's Chorus Frog's call?

"Rrrack-rrrack-rrrack-rrrack-rrrack" is the call of Brimley's Chorus Frog (Pseudacris brimleyi).

Specifically, the voice of Brimley's Chorus Frog is a raspy trill. It tends to be repeated about two times per second. It is similar to the call of the Squirrel Treefrog (Hyla squirella), whose range and habitat may overlap. But the timing of the voices tell all: Squirrel Treefrogs breed in late spring and summer whereas Brimley's Chorus Frogs will be heard on warm winter days.