Greg held his breath as the shark swam past. That’s when he saw the remora on the shark. A remora is a long, skinny fish. It has a structure on its head that looks like a suction cup. This allows it to attach to other fish.

Greg could not stop thinking about what he had seen after the dive. He wondered if a camera could be stuck to a shark, like a remora. If he could figure out how to do that and get the camera back, he’d see the ocean from the shark’s point of view. The “hitchhiking” camera would go where the shark went. It would record what the shark saw and did.

Greg’s idea became an invention called Crittercam. Crittercam is a camera that shows us the secret lives of ocean animals. It’s a way to swim with them without scaring them.