We just learned about the Cephalopod - Cirrus.
Another interesting thing is the Cephalopod Skin.
Cephalods like the octopus or cuttlefish can change their skin color, or if their skin is bumpy or smooth.
A fancy word for this is polyphenism.
Their skin is made up of an outside layer that has gooey mucous and sensors to tell when it is being touched.
Underneath that top layer is a layer made of collagen, which is like a fatty cell that holds skin together.
There are also cells in that layer for changing the color of the skin.
Most of an octopuses body is made up of soft tissue like collagen, and their squishy body makes it so they can get through really small holes.
They don't have any hard parts of their body except the beak, so even a big octopus can squeeze through a 1 inch hole!
(from: wikipedia - cuttlefish)
Watch The Octopus Squeezing Through Very Tiny Spaces - Animals R Us
Kid Facts - Blast from the past: Frogspawn
