Shelley is a scallop owned by SpongeBob, and is hung in a birdcage in the latter's bedroom. She first appears in the pilot episode "Help Wanted."
Shelley is a small and light purple scallop. She is normally kept in a cage hanging from SpongeBob's bedroom ceiling.
Shelley has appeared in many episodes, but has never been addressed directly. In the PC version of The SpongeBob SquarePants Movie video game, during "Chapter 1: Love Thy Neighbor," she gets out of her cage.