Many nudibranchs use their brightly colored bodies to warn potential predators that they are full of distasteful chemicals. This is an alternative defence mechanism to having a hard shell, which most other molluscs use as primary protection.

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Nudibranch

The large oval eyes allow the whitetip to see well in dim light.

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Whitetip Reef Shark

A diver explores the wreck of SS Carnatic, which broke in half after hitting the reef near Shadwan Island. 31 people drowned.