But I was even more surprised to hear the frogs. It’s still March! I assume these were Western Chorus frogs, judging from the audio on this MPCA page on frogs for kids. Here’s a 14-second video clip with audio:
Also, see this great article on the DNR’s website: Sense of Place: Attuned to Frogs – A wetlands researcher steps into the muck and finally hears the frogs.
And sign up for the DNR’s 2010 Minnesota Frog & Toad Calling Survey (MFTCS).