The Australasian region includes Australia, New Guinea, New Zealand and southern Indonesia. Within these regions, different species of mammal have slowly evolved to suit a particular climate or range of plant life. So the tropical grasslands in the Ethiopian region of Africa, for instance, contain a different range of mammals to those in Neotropical South America. The mammals of the South American grasslands, such as the pampas deer and a rodent called the capybara, are much smaller. Mammals of the air Birds are not the only creatures that can fly.
Bats can fly, too, but their wings are leathery skin rather than feathers.
During the day, bats sleep, hanging upside down. At night they fly off in search of food, finding their way in the dark by emitting a series of high-pitched clicks. The way these sounds bounce back off insects, rocks and other obstacles helps the bats locate exactly where they are. Bats are the only mammals that can really fly, but flying squirrels and flying lemurs can glide huge distances from tree to tree. The tropical grasslands or savanna of Africa are among the world's most spectacular wildlife habitats.