Man-eating sharks

The man-eating sharks were originally introduced into the series in the 13 storey treehouse. They didn't ever eat any real humans, despite their name, with the exception of one of the sharks having Captain Woodenhead's wooden head found in one of their stomachs in the same book. In The 26-storey treehouse Jill explained that she, Andy, Terry and all her animals were forced to jump off the plank of Captain Woodenhead's ship into the water where the man-eating sharks were circling them below. But Jill pleaded them to help her and Andy and Terry added the sharks into their treehouse.

Appearence
The man-eating sharks appear to have razor-sharp teeth. Andy and Terry has a tank designed as a home for the three sharks.

Trivia

 * In the 26 storey treehouse, Terry accidently washed his underpants in the shark tank and they became sick by eating it, but Jill operated on them to recover.
 * Andy and Terry added the shark's tank as the 3rd level in the 13-storey Treehouse.