Shimatori

 The Shimatori (シマトリ) was a creature developed by Dr. Indigo was Shiki 's plot to use monstrous creatures to attack East Blue to get the World Government to submit to him.

The Shimatori is a strong 4-winged, savage, and mysterious bird. It dishes out powerful strikes with it's 4 wings, and it swoops down on its unfortunate prey.

Trivia
It's name comes from the Japanese words shima (縞) which means stripes, and tori (鳥) which means bird.

It appearance seems to have been influenced by roosters, as well as the United States' flag.

It bears some resemblance to the Basilisk of Impel Down.