She will pull the two shells apart. Then she will do a funny thing. A starfish has a mouth on the bottom of her body. They have eight arms and an eye on each side of their head. They have really good eyesight but they can't hear.
Octopuses eat small crabs.
They live on the ocean bottom. A blue whale is the largest animal alive. It is about as long as two school buses. A baby whale is called a calf. When a calf is born, it knows how to swim.