Nudibranch's eyes are located inside the body and measure about a quarter of a millimeter in diameter. These simple eyes are only coarsly able to discern differences in light intensity.

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Chamberlain's Nembrotha

All of our dives on Cocos featured hammerheads, most shy and in the distance like here. One of my best memories from Cocos was the ascent on a site called Manuelita, which we dove many times. What we didn't realize at first was that the hammerheads had disperged and moved away when we got there. Immediately when we started to ascend they returned. During our safety stop we saw the hoards coming from all directions and reuniting at the cleaning stations on the ocean floor.

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Scalloped Hammerhead Shark

Participating in a huge feeding aggregation, the massive amount of anthias make some of the visually dramatic scenes on the reef. Anthias live in harems consisting of one dominant male, a few lesser males, juveniles and a cluster of females. All anthias are hermaphrodites and begin life as female.