Researchers detected short clicking noises from rig sharks during handling in the lab, though they're not sure why or how the sound is produced ...

Electroreceptors on their head detect the ... tightly into cracks and crevices in the coral are a target, as the shark’s slender body allows it to squeeze into impossibly small holes.

"Sharks have sensory systems that are more refined than their hearing, like their electroreceptors ... They transferred each shark into a tank equipped with recording devices.