Garden eels and an unlikely alliance. A fish and a shrimp that share a burrow. In a world where most food is out of sight,it takes a predator with special talents to find it. And this is that predator.
The ray
The ray's special skill is to find living things under the sand,and the largest species to do this here is the stingray. It finds its prey by detecting the minute electrical fields produced by muscles when they contract,including heart muscles.