Both cephalopods (i.e., ‘head-foot’), the cuttlefish has a calcium carbonate bone which controls its bouyancy.

http://www.congo-pages.org/ET/DIVE%2520TIMOR/BF/Squid_Octopus_Cuttlefish/images/dsc03112-copy_edited.jpg&imgrefurl=http://www.congo-pages.org/ET/DIVE%2520TIMOR/BF/Squid_Octopus_Cuttlefish/pages/dsc03112-copy_edited.html&h=450&w=600&sz=206&tbnid=avoKvxGG33ettM:&tbnh=99&tbnw=133&hl=en&start=26&prev=/images%3Fq%3Dsquid%2Band%2Bcuttlefish%26start%3D20%26num%3D10%26hl%3Den%26lr%3D%26sa%3DN%26as_qdr%3Dall" alt="" />

Squid have a flexible, chitin, ‘pen’ which does not control bouyancy.

http://www.congo-pages.org/ET/DIVE%2520TIMOR/BF/Squid_Octopus_Cuttlefish/images/dsc03112-copy_edited.jpg&imgrefurl=http://www.congo-pages.org/ET/DIVE%2520TIMOR/BF/Squid_Octopus_Cuttlefish/pages/dsc03112-copy_edited.html&h=450&w=600&sz=206&tbnid=avoKvxGG33ettM:&tbnh=99&tbnw=133&hl=en&start=26&prev=/images%3Fq%3Dsquid%2Band%2Bcuttlefish%26start%3D20%26num%3D10%26hl%3Den%26lr%3D%26sa%3DN%26as_qdr%3Dall" alt="" />

Both have ten tentacles and beaks.

If you buy cuttlefish bones for your birds to peck, occassionally, you will see teeth marks from fish or dolphins in them.

hf_matty))))7 years ago

medical field originally knew about the human nervous system came from studying squid.

i love squid!

I worked for a company that dove off NZ to search for architeuthis;
giant squid

matty~ 7 years ago

You may be wondering “why?”. Because. Squid are cool. I was watching a story about how squid have attacked people before and was wondering what else is known about these fascinating, and I think incredibly misunderstood creatures. 7 years ago