The pair of shrimp clears a little patch on the fire urchin with their claws. The patch is just large enough to move freely around collecting small pieces of food while still being protected from predators by the urchin's toxic spines. The largest of the shrimps is always the female.

DSC03330.jpg

Coleman's Shrimp

The wide-set eyes give hammerheads long visual range, better than most sharks.

DSC02499.jpg

Scalloped Hammerhead Shark

Dolphins use echolocation to "see" the environment, similar to a sonar or radar. They send out bursts of clicking sounds, and based on the frequency of the return signal, and how much time the signal used to return, the dolphin can estimate what kind of objects are nearby.