the blueringed octopus is a mammal
they descended from earlier reptiliomorph amphibious tetrapods which lived on land that was already inhabited by insects and other invertebrates as well as ferns mosses and other plants
 the terrifyingly powerful gorgon of greek mythology may have been inspired by the octopus or squid the octopus itself representing the severed head of medusa the beak as the protruding tongue and fangs and its tentacles as the snakes