Crayfish, which are freshwater crustaceans closely related to lobsters, have large claws with which they threaten predators and protect themselves. In addition, when crayfish are frightened, they make menacing gestures with their claws, propel themselves backwards and use their tails to throw mud at their enemies.Know More
Unlike lobsters, which live in saltwater seas and oceans, crayfish inhabit lakes, rivers and streams. They are also smaller than lobsters, usually only about 2 to 6 inches in length. They use the rocks, logs or muddy bottoms of their freshwater habitats to hide themselves from potential predators. When water levels are low, crayfish burrow into the mud. At night, they come out to feed on mollusks, insects, worms, snails, tadpoles and aquatic vegetation.
Crayfish are hunted by numerous predators in the wild, including raccoons, foxes, snakes, turtles and birds. Humans hunt crayfish for food, bait for fishing and to display as pets in aquariums. Crayfish are considered a delicacy in many parts of the world, but normally, only the tails are eaten. Fishermen use crayfish to catch such species of fish as bass, pike and catfish. Crayfish thrive in freshwater aquariums, and if they are fed properly, they are non-aggressive and can co-exist with various species of fish.Learn More
Some of the beluga whale's most distinguishing physical features are its white or light coloring and uniquely shaped head, which is broad and round with a big forehead. This whale primarily lives in arctic and sub-arctic environments.Full Answer >
Narwhals are real animals. They are a type of medium-sized whale. The narwhal is known for its distinct tusk, which is actually a canine tooth that protrudes from its forehead.Full Answer >
The natural habitat of the piranha is limited to fast-flowing freshwater rivers and streams. Native to the jungles of the Amazon Basin, Pygocentrus nattereri has been spotted in nearly every South American country.Full Answer >
Cnidarians that move do so by flexing weak, gelatinous muscles in the body walls of their bells against a pressurized hydrostatic skeleton. However, many types of cnidarians, such as mature anemones and corals, move little if at all, although juvenile stages may take a more mobile form to disperse individual organisms. Even the more mobile types, such as jellyfish, move only weakly and generally drift as plankton with the current.Full Answer >