Nonverbal clues, anyone?...
Chimpanzees can't talk, but they can still fib. Researchers found that chimps can divert other chimps, and thus keep them from realizing that the first chimp is hiding (and not sharing) a banana.
We humans are so much smarter, we should be able to tell when others are trying to deceive us, right? Just to be sure, here are two short videos:
There, now I feel smarter, don't you?
For TT's Communication day