Scientists in Colombia have discovered a new species of scorpion, Tityus achilles, which can spray venom to defend itself ...

from arthropods to mollusks to mammals, use toxungens in defense and occasionally for hunting. These compounds may be sprayed, smeared or passively transmitted. The scorpion is able to deliver ...

Some species grew to more than six feet (two meters) in length and are considered the largest arthropods ever to have lived. Bearing a resemblance to their scorpion descendents, eurypterids had a ...