Listening to the sounds of nature is known to make people feel more relaxed, helping reduce stress and anxiety as well as improving mood and productivity. But the calls of some animals are not so ...

Sloths are some pretty interesting animals. Beyond their reputation for being slow, a host of different traits reveals a lot about their evolution and behaviors. Take for example their mating calls.

Koalas have built a reputation as low-key animals. While other species compete for territory or put on elaborate courtship ...