The birds eat fish, crustaceans, insects, small reptiles, snails, frogs, worms and crayfish. Some crustaceans that are commonly eaten are shrimp, lobsters, crayfish, and crabs. Various insects, jellyfish, millipedes, centipedes, freshwater crayfish and freshwater mollusks. Seafood includes an array of shellfish such as crabs, clams, cockles, crayfish, shrimp and squid. Their diet consists of algae, mollusks, crustaceans, insects, crayfish and other smaller fish species. Seafood such as oysters, mussels and crayfish are not uncommon. Young American alligators eat small fish, frogs, crayfish, and insects. Kool is a seafood broth from Jaffna containing crab, fish, cuttlefish, prawns, and crayfish. It can be made from lobster, langoustine, crab, shrimp, or crayfish. This is often supplemented by frogs, crayfish and crabs. They have been seen eating tadpoles, fish, aquatic insects, and crayfish. They also may eat fruit, small crayfish, eels and amphibians. Walleye also feed heavily on crayfish, minnows, and leeches. Those embryos which are not eaten by fish, insects, or crayfish hatch within two weeks. The large family Parastacidae includes 124 species of Australian freshwater crayfish.