Adult orbicular batfish
Orbicular batfish (Platax orbicularis) inhabit the coast of East Africa, India, Indonesia, Melanesia and Australia. 
Image credit: Alexander Vasenin (CC BY-SA 3.0)
Juvenile orbicular batfish
These juveniles are a rusty red-brown colour until they grow to about 6cm. This allows them to drift in the water like dead leaves - perfect camouflage for their mangrove and river mouth nurseries.