Typically one will see White-lipped Treefrogs, Clown Treefrogs, Polka-dot Treefrogs, and perhaps a sleeping Iguana. But one little frog makes a curious noise, and it sounds like someone tapping two rocks together. A careful search will eventually yield an Amazon Hatchet-faced Treefrog (Sphaenorhynchus dorisae).
Green like the plants they live in and so soft they look like they're made of jelly, Hatchet-faced Treefrogs have a Zen-like quality about them. Perhaps it is the horizontal eyes, or maybe their calm demeanor. When it is breeding season these amphibians lay masses of pearly eggs among the water lettuce. But it is the distinctive clack-clack-clack of their call that makes them so typically a part of the Amazon.