Also posted Oct 8 on Pharyngula

Architeuthis Double-Dactyl

Haughtily, naughtily
Deep-sea biologists
Claimed “We will never find
Fifty-foot squid!”

Nobody told, though, the
Cryptoteuthologist
Blissfully ignorant,
That’s what he did.

Nautilus Limerick

The nautilus swims back-to front
Which is quite an unusual stunt
But his shell–which is odd
For a cephalopod–
When he bumps into things, bears the brunt!

Cuttlefish Physiology Limerick

Look again, and you might doubt your eyes:
It’s the cuttlefish, cloaked in disguise!
As it changes, within
Its remarkable skin
Are chromatophores, changing in size.