Swimming is movement without artificial assistance. Its primary uses are bathing, cooling, travel, fishing and escape. An individual’s ability to swim can be judged by speed or stamina. Almost all mammals can swim by instinct. Bats, kangaroos, moles and sloths can swim, despite their rather strange shapes. The few exceptions include apes and possibly giraffes. Land birds can swim or float for at least some time. Ostriches, cassowaries and tortoises can swim.