Bookend

Bookends are large living books in Super Mario 64 and Super Mario 64 DS. Their name is taken from referring to a shelving accessory used to keep a row of books upright.

Super Mario 64 / Super Mario 64 DS
Bookends appear only in the course Big Boo's Haunt. There are two types of Bookends. Members of the first type possess sharp teeth and disguise themselves as regular books within a bookshelf. If Mario gets close enough, they slide out, open their mouths, and charge through the air at him to attack. The green books disappear if they hit anything, including Mario. Attacking them gives Mario a Blue Coin and destroys the books. Members of the second type are found in only one room, the library, where they are found in infinite numbers. Members of this type are smaller, never open their mouths, and fly quickly from one shelf to the other in order to attack Mario. If Mario inputs the sequence to open the hidden door incorrectly, a Bookend hits him instead. Getting attacked by either type of Bookend results in losing two wedges of health. In the DS version, both types of Bookends do the same to Luigi and Wario.

Mario Party 8
Bookends also appear in King Boo's Haunted Hideaway in Mario Party 8. They hover around in the rooms instead of lunging at players.

Mario Party DS
In Mario Party DS, Bookends appear as enemies in the minigame Book Bash, where they flap as they fly around and are minions of Kamek.