I’ve often spoken of my favorite animal: the octopus. Did you know it’s part of the group known as Cephalopods? They are a class of mollusks and include animals such as nautiluses, squids, cuttlefish, and of course the octopus.
Many of these animals can change colors as shown by this squid: https://www.youtube.com/watch?v=Kq35cQF8pyE They can change colors faster than even chameleons and can do more colors. Squid are definitely a mystery. It’s believed they are one of the fastest growing animals in the world. They start out tiny but within 2 years it’s possible they can reach 50+ feet.
Because they’re mollusks all of Cephalopods have shells. In octopuses the shell is hidden. In squid it’s changed into a whole new structure.
The Nautilus is the only cephalopod that doesn’t use ink to defend itself. It has a long lifespan compared to most cephalopods as well, some hitting 20 years in the wild. They take 5-10 years to reach sexual maturity and lay few eggs. Their shells make them popular for tourists to collect. The combination of slow reproduction and valued shells actually places this guy in danger.
Interested in knowing more? http://www.actforlibraries.org/the-amazing-cephalopods-nautilus-squid-and-octopus/