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The zebra bullhead shark (Heterodontus zebra) is adorable, a close relative of the horn shark, and gets up to four feet.  Being a bullhead shark, it also lays those bonkers corkscrew eggs.

The egg cases can be wedged into crevices and so forth (bullhead sharks don’t go in for cementing them to things), and the cases harden within a day of laying, so they stick there if put in right.  Bullhead sharks do this by picking the cases up with their mouths, one of the very rare known cases of parental care in egg-laying shark species.

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