Swimming

Swimming is movement by humans in water, usually without artificial assistance. Swimming is an activity that is both useful and recreational for many species. Its primary uses are bathing, cooling, travel, fishing and escape. An individual's ability to swim can be judged by speed or stamina. Humans with lungs have an easier time floating than those without.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.