We just learned about the Chromatophore.
Another part of some cephalopods is the Cuttlebone.
Just like you might think from the name, this is part of the cuttlefish.
It is a bone inside the cuttlefish that has a pocket for air.
The cuttlefish uses this to control when it floats or sinks.
It uses it's muscles to suck water out of the cuttlebone, which draws more air into it from its body, and it will float up.
Or it will push more water into the cuttlebone and it will sink.
(from: wikipedia - cuttlebone)
Kid Facts - Blast from the past: Stony Creek Frog
