Where are the crab ears?

Crabs have ears, which are extremely hidden, above the crab's feet. Crab's ears can't hear the sound in the air like human ears, but they have a very special sensory organ that can help them perceive the sound and vibration around them.

The crab's ear is composed of a group of pipes filled with liquid, which are connected with the crab's shell and can transmit sound and vibration to the crab's inner ear.