Nautilidae (Nautiloidea)
Nautiluses (Nautilidae) are marine animals belonging to the cephalopod family, which also includes octopuses and cuttlefish. They have a spiral shell and are the only remaining species of the once-diverse group of cephalopods known as the nautiloids. They have a unique system of gas-filled chambers that allows them to control their buoyancy and can grow up to 8 inches (20 cm) in diameter and weigh up to 20 pounds (9 kg). They are found in tropical and subtropical waters of the Pacific and Indian Oceans and are carnivorous, feeding on crustaceans, fish and other invertebrates. They are nocturnal animals, slow-moving and considered to be vulnerable to extinction due to overfishing and habitat destruction.
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By © Hans Hillewaert, CC BY-SA 4.0, https://commons.wikimedia.org
