Animals, lies and language
An honest signal is useful for the one sending and receiving it. But, dishonest signals tend to destabilize the ability to communicate. How did human language develop when words make it so easy to fib?

Here’s a link to the wild dolphin project.

Wild Dolphin Project

Here’s a video about ongoing attempts to communicate with dolphins in the wild.

Searching for Language in Dolphins

Here’s an article about one of many theories regarding the differences and development of primate and human language.

Human Language Rooted in Monkey 'Song,' Scientists Suggest