Have come across these creatures in reading and they are fascinating. Mantis shrimp, one of the dominant species of coral reefs, are included in this group. I haven't come across an explanation yet about why they are called "mantis," but that will come.

Anyway, there are many fascinating habits of these stomatopods:

They can recognize individuals within their species;
They have been shown to be monogamous;
Some can roll into a ball, thereby turning themselves into a wheel, and roll off a beach back into the water in order to save themselves if beached;
They are the only known creature to behave as wheels for locomotion, according the site I'll paste below;
And the mantis shrimp will use its ten legs to dig away at sand for a cave, its protective hiding place, and, even more amazing, will take its eight arms and form a basket or bucket with which to heave sand out of its cave.

If you don't know about the stomatopods, take a look at the url below.

Hey, tsuwm! Or Doctor Bill! What's the adjective for shrimp-like? (I don't think the mantis shrimp is a true strimp.)

http://blueboard.com/mantis/