Clay robber frogs take to ultrasonic screaming when they're feeling un-hoppy. The rainforest can be a noisy place to be, so how do you make yourself heard if you end up in trouble? For the clay robber frog, the answer is to give off an almighty scream – but it’s one that we humans can’t naturally hear. However, a team of scientists have now successfully recorded it for the … [Read more...] about Frogs Are Screaming But We Can’t Hear Them