Pearl Bird

Pearl Bird is a bird-like creature that appears in the game, Wario Land 4. It is one of the many enemies found in the infamous Adventure mode level, Floating Islands.

In Super Smash Flash
Pearl Birds belong to the many aerial enemies in Super Smash Flash, alongside Flying Goombas, Buzzers, Beezleys and Mayu Birds. They are exclusive to the aforementioned Floating Islands, where they follow the player around where contact with them results in the character taking damage and getting pushed back a bit. Though they can be persistent if a swarm surrounds the player, a single attack is enough to take them out.

Trivia

 * In Wario Land 4, Pearl Birds are not actual enemies, in fact, they are actually helpful towards Wario as they spit out glass balls from their mouth (a trait not seen in SSF) that he may use to solve certain puzzles to earn treasures.