Australian toxinologist Jamie Seymour made a documentary about the jellyfish called 'Killer Jellyfish'. The cnidarians include corals, sea anemones, jellyfish and hydras. Cnidarians include corals, sea anemones, jellyfish and hydrozoans. Animals such as sharks, stingrays, Weever fish, seals and jellyfish can sometimes present a danger. This species feeds mainly on fish, squid, jellyfish and crustaceans. The prints shifted from reptilian to prints of water creatures such as jellyfish and stingrays. They feed on small crustaceans, molluscs, jellyfish and salps. Small fish, jellyfish, and squid are also taken. The summer months carry warnings to swimmers regarding venomous jellyfish and other dangerous sea creatures. This has been shown to lead to increased abundance of fish and whales over jellyfish. This allows for less competition between the moon jellyfish and other fish predators for zooplankton. During this stage it is susceptible to jellyfish and fish larvae through adults. Very little is known about the life cycle and venom of Irukandji jellyfish. Some true residents associate with drifting jellyfish or seaweeds. Many have fluid-filled, hydrostatic skeletons, like jellyfish or worms.