burrow: a hole dug in the dirt as a nesting site or shelter

camouflage: features such as coloration that help an animal hide in its natural surroundings

countershading: the dark back and light belly coloration of some marine animals (sharks, rays, penguins) that helps camouflage them in the open ocean

chick: a baby penguin

habitat: the place where a animal or plant lives

incubate/incubation: to sit on eggs to maintain a favorable environment for hatching

krill: a shrimp-like animal

molt: annual process by which penguins shed their old feathers and replace with new ones

predator: an animal that hunts another animal for food

preening: in birds, the use of the beak to clean, arrange and condition the feathers

prey: an animal hunted by another animal for food

regurgitate: to vomit partially digested food; penguin parents will regurgitate fish to feed their chicks

rookery: nesting place for a colony of birds

Southern Hemisphere: the portion of the earth located south of the equator

territory: the area an animal defends as its own