Remora
Remoras, sometimes called suckerfish or sharksuckers, are fish in the family Echeneidae of ray-finned fish in the order Carangiformes. They are small fish that live on and around sharks. They eat stray bits of food left by the shark and tiny shrimp-like parasites that live on the shark's skin. They have sucker-like disks on their heads with which they attach to the shark.