Introduction

A gazelle surrounded by lions in the bush will do something surprising. Using all four legs, it will jump one, two, three feet off the ground over and over again. It is saying to the lions, don't come after me. I cannot run you so easily that I'm willing to waste energy jumping up and down. The yellow banded poison dart frog looks like some form of superhero with bright yellow stripes. Evolutionarily, this signal is really profitable for the frog. What exactly do peacocks need all those feathers for? They're expensive. And they require a lot of food to grow. Plus, it makes it really hard to run around because you're carrying all these