The Octopus is a mollusk belonging to the class Cephalopoda. All 300 species have no skeleton, allowing them to squeeze into tight spaces to hide. When they get caught off guard they might release ink to cloud the water and allow them to escape. They are known for their eight arms lined with suction cups and large bulbous head. Octopus are considered the most intelligent of all invertebrates. Scientists have been testing their intelligence, and they have proven their high intelligence by solving puzzles and mazes along with other tasks. I find this animal to be absolutely fascinating and among my most favorite!