Blue-cheeked Butterflyfish Chaetodon semilarvatus

The Blue-cheeked Butterflyfish is also called the Addis Butterflyfish. It is native to coral reefs only in the Red Sea and its diet is exclusively coral polyps. It grows up to 20cm long.

In some light (or lack of light) the blue cheek can look dark. When stressed or sleeping (in crevices), many butterflyfish can blanch their yellow daytime colour.