Dinosaurs often swallowed large rocks. These rocks stayed in their stomach and helped them grind up food.

Emperor penguins can dive to 1,850 feet underwater, which is deeper than any other bird, and can stay under for over twenty minutes.

Only female mosquitos bite humans and animals. Male mosquitos only feed on flower nectar.

Sea otters have skin pockets where they keep their favorite rocks to keep for cracking open mollusks and clams.

The praying mantis can camouflage itself by changing color. It can vary from dark brown to green to blend in with tree bark and leaves. This enables it to hide from predators and also sneak up on prey.