Pinky is a giant bird.
As Luffy and Zoro sailed away from Shells Town, Luffy got hungry and wanted to catch a bird.
This was supposed to be Pinky. However, Pinky grabbed Luffy by the head and flew away. Over the port city of Orange, Pinky was then shot down by Buggy’s gang. He dropped Luffy, who smashed into the middle of a street.