Spiders.

"Araneae."

A spider is an eight-legged arthropod that breathes air. They

have fangs that inject venom.

Spiders are found on every other

continent except Antarctica, and are established in every other habitat including air and sea. A spider has appendages that has been modified into spinnerets that extrude silk from six different types of silk glands. These are called spider webs. They vary in size, shape and the amount of sticky thread used. 

 

       Spider-man was bitten by one these, but it was radioactive.