I'd never had the pleasure of hearing wood frogs (Rana sylvatica) "live in concert" before but following up on a tip from a friend I was thrilled to find a huge number at a vernal pool at Kickapoo State Park. Temperature was upper 60's though my understanding is that they will breed at much lower temperatures. In the picture of the pond itself all the glowing spots are frog eyes. Although Spring Peepers were also present in large numbers, the males were not calling from in the water itself, so I suspect all the eyes in that shot are wood frogs.
Spring peepers (Pseudacris crucifer) were present at one of two vernal ponds I visited and deafening at the other. Temperature was in the upper 60s, unseasonably warm. Largely overcast. They were active before sunset but, as I say, deafening after.
