They can be tiny like an insect or huge like the giant squid. Invertebrates are animals that don't have a backbone. Some have soft bodies, like worms, slugs and jellyfish. Other invertebrates ...

Tusoteuthis was a giant squid nearly equal in size to those that ... The pen was akin to a backbone but made of delicate shell-like material called chitin. The pen supported a fleshy body with ...