Nudibranchs have shells as larva, but shed them when they mature. Shells are heavy and make moving around difficult. Most molluscs use the shell as a primary defence, but nudibranchs have developed other techniques for protection, such as toxic secretion. A few make their own poisons, but most utilize the toxic metabolites from what they eat.

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Arminid Nudibranch

Malapascua is known for its legendary thresher sharks. They are usually found in deep waters, but when the sun starts to rise they ascend to the cleaning stations on the sloaps of Monad Shoal. Diving starts 05.00 am.

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Thresher Shark

Unlike most fish who use suction to capture their prey, moray eels use two sets of jaws in their throats to drag prey inside their mouths.