Over time animals have developed many ways to stay away from predators.
A predator is an animal that hunts and eats other animals.
Hiding is one of the best ways to stay alive.
Some animals hide by looking like the places where they live.
To see how this works, let's look at the sea dragon.
It is a master of disguise.
The sea dragon is covered with skin that looks like leaves.
The skin helps the dragon look like a piece of seaweed.
A hungry meat eater would stay away from anything that looks like seaweed.
Other animals stay safe by showing their colors.
They want other animals to see them.
Scientists call these bright colors -- warning colors.
You have probably seen animals that have warning colors.
Some grasshoppers show off their own bright colors.
Those colors don't just look attractive;
they tell their enemies to stay away.