Shellfish include various species of molluscs, crustaceans, and echinoderms. Eggs are common among invertebrates, including insects, spiders, mollusks, and crustaceans. Sawfish are predators that feed on fish, crustaceans and molluscs. They mainly eat insects, small crustaceans, and mollusks. Among the marine crustaceans eaten are amphipods, crabs and krill. They feed on small crustaceans, molluscs, jellyfish and salps. Adults are planktonic and the larvae parasitise decapod crustaceans, especially crabs. Most stingrays feed primarily on mollusks, crustaceans, and occasionally on small fish. Pelagic birds feed on planktonic crustaceans, squid and forage fish. Their diet ranges from fruit and plants to insects, crustaceans and molluscs, and small mammals. Arthropoda include insects, crustaceans and arachnids. Albacore are pelagic predators that eat a variety of foods, including fish, crustaceans, and cephalopods. Crustaceans, especially copepods, dominate the zooplankton. They include fish, crustaceans, and cephalopods. Yellowfin tuna prey include other fish, pelagic crustaceans, and squid.