the largest known fish that can live to be over 100 years old

the largest living lizard

the hard, movable plate covering a fish's gills

toothlike scales found on sharks

a scientist who studies fish

this lizard breaks blood vessels by its eyes and then squirts the blood at its predator up to 3 feet away

a large gas-filled organ located high in the fish's body that allows the fish to stay suspended in any depth of water

shark babies

eggs laid by a female fish, which are fertilized by a male fish

the largest living reptiles that have thick skin, elongated, reinforced skulls with massive teeth, and care for their young - includes crocodiles, alligators, and caimans

the fin that sticks out from the fish's tail and is used as a propeller

a protective case where a shark lays its eggs

cartilaginous fish with flattened bodies

a lizard-like reptile that has a parietal eye

fins located on the side of a fish and behind its gills; acts as rudders, paddles, or brakes

the breathing openings that sharks and rays have behind their eyes

an organism with slime glands that help create a slippery coating around it

the protective layer that surrounds the nutrient-filled egg of a reptile

W-shaped bands of skeletal muscles