Every summer about this time, gray tree frogs converge on Iowa ponds for mating and egg-laying, and with hundreds of frogs involved, the calling becomes a roar. They are commonly heard in forests from late spring to mid-summer, especially on quiet rainy days, but more frequently at night. Around these small breeding ponds, however, is probably the only time you'll hear them in super-concentrated numbers. The video doesn't do the overall noise level justice, because it is truly deafening. | Iowa

7.7K views · 626 reactions | Did you know that gray treefrogs are only active at night? During the day, you might spot them hiding out and blending in. This one was hanging out on a porch with a spring peeper nearby. Video: Gray treefrog by Megan Seymour/USFWS. | U.S. Fish and Wildlife Service | Facebook