In the seas around Indonesia lives an unusual fish, the Great Sunda Chameleon Fish. The fish is named after the Great Sunda islands, which include Borneo, Sumatra, and Java. As the reader can judge from the name, this fish can change its colour at will to fit in with its surroundings. However, this is only half the story…

The chameleon fish is a solitary fish and doesn’t usually swim in shoals. A fully grown adult is about twenty inches long with a girth of roughly eight inches, at least that’s the size when it’s in the natural state. If the chameleon fish feels threatened or wants to swim with other fish for a while, it can puff itself up to twice its natural girth and add around 3 – 4 inches to its length, by allowing sea water into some naturally spongy chambers along its body.

Excerpt from – Animals Evolution Avoided