Frogs, foam nests

Back in June of last year, I showed some small foam nests in a clump of lemon grass made by some unknown insects. Last week, I took this picture of a foam nest made by a frog, probably a cane toad. There were several of them around on the ground of an ancient creek bed located down the hill from the Bosque reception center. Compared to the insects, these are obviously quite large. On the next image I've included a set of keys for a reference point.