Some spiders are small. Some are as small as the head of a pin.

Some spiders are big. One of the biggest spiders is the Goliath Bird-eating Tarantula. It is bigger than a human hand.

Large or small, all spiders have some things in common. They all have eight legs. They all have fangs. Fangs are long, sharp teeth.

Spiders are helpful to people. They eat insects that harm farm crops. They eat insects that carry diseases. Think twice before you squash one!