Though no human population is native to Antarctica, about 1,000 people work there in the summer months, and another 12,000 tourists visit every year. They come to enjoy the unspoiled environment, the bright blue skies, and the fresh white snow fields. If a tourist is lucky enough, he or she can join an expedition to see some of the continent's other residents. Animals along the coast of the Southern Ocean don't mind the cold weather, and thrive in Antarctica's seas. Penguins and seals breed on the icy shores and fish for krill in the cool water.