Gentoo penguins are quite distinct from any other penguin, with the white stripe across the top of the head and bright orange bill. They are also better swimmers and divers than other penguins. Their super-streamlined bodies make them the fastest penguin underwater, able to reach speeds of 36kph, and they can dive to 170 metres down into the deep ocean. Gentoos breed in colonies in the harsh, cold climate of the islands surrounding the Antarctic, using nests made of stone and grass. Their droppings then fertilise the grass ready for the following year.