February Frog Fracas

On this fine February afternoon in a muddy pond in C&O Canal National Park in Potomac, Maryland:  Frogs gone wild!  The water was roiling with them.  And listen to those voices!   

They are wood frogs, and I appear to have caught them breeding, according to the Maryland Department of Natural Resources and Towson University websites.  I've never encountered them quite this early in the year.  A sign of spring?