Emperor penguins migrate to their birthplaces every winter to mate and reproduce. They lay one egg per couple and both parents take turns incubating the egg and watching over the offspring. Penguins are well adapted to survive in harsh Antarctic conditions with features like streamlined feathers that help them endure the cold weather. However, they face threats from predators like leopard seals and killer whales in the ocean and birds that attack offspring on land. Laws now protect penguins from being hunted by people.