Bigfin reef squid (Sepioteuthis lessoniana). This squid inhabits coral reefs in the tropical Indo Pacific region. It can rapidly alter the colour of its skin, which it uses for camouflage and communication. This squid reaches a length of over 30 centimetres. If feeds on small fish and crustaceans, which it catches with a quick strike from two tentacles (not seen), which are usually kept hidden amongst its eight arms. Photographed in the Lembeh Strait, Sulawesi, Indonesia.
