Page 187 - (DK) Super Shark Encyclopedia: And Other Creatures of the Deep

SCARY SMILER

The sandtiger shark has one of the toothiest
grins of any shark and a distinctly menacing
look. Its teeth project forward and the shark
swims with its mouth slightly open. Some
sandtiger sharks have tiny animals called
hydroids growing on their teeth. This probably
happens when they have gone for a long
period of time without feeding. Some
scientists think that female sandtigers stop
hunting while they are pregnant.