Nautilus usually moves at night, rests on the seabed during the day, and holds the rocks on the seabed with tentacles. Living in the depth of 600 meters from the ocean surface, it is necessary to control the amount of gas so that Nautilus can adapt to the pressure at different depths. Nautilus is a carnivore, and its food is mainly small fish, mollusks and benthic crustaceans (especially small crabs). After artificial domestication, you can feed and eat frozen fish, squid and shrimp during the day. At night after the storm, nautilus will float on the sea in droves, which is called "elegant floating objects" by sailors.

Nautilus is the top predator in the Ordovician ocean, with a body length of 1 1 m, and mainly feeds on trilobites and sea scorpions. In the heyday of marine invertebrates, it occupied the whole ocean with its huge size, sensitive sense of smell and fierce beak.