Crowber

Crowber is a crow-like enemy found in the game New Super Mario Bros..

New Super Mario Bros.
Only seen in World 8-1, these black birds swoop down at the player at high speeds. As progress is made throughout the level, more will appear and chase after the player. Crowbers fly fast, making it somewhat difficult for the player to defeat them. They squawk before swooping down at Mario.

New Super Mario Bros. Wii
Crowbers also reappear in the game New Super Mario Bros. Wii. This time, they were more purplish, and appeared in World 7-Ghost House and World 8-5.

Trivia

 * The name Crowber is a pun on "crowbar", a tool used to remove nails.