Kangaroos have long been regarded as strange animals. Early explorers described them as creatures that had heads like deer (without antlers), stood upright like men, and hopped like frogs. They have large, powerful hind legs, large feet adapted for leaping, a long muscular tail for balance, and a small head. Like all marsupials, female kangaroos have a pouch called a marsupium in which joeys complete postnatal development. They are the only large animals to use hopping as a means of locomotion. The comfortable hopping speed for Red Kangaroo is about 20-25 km/h (13-16 mph), but speeds of up to 70 km/h (44 mph) can be attained, over short distances, while it can sustain a speed of 40 km/h (25 mph) for more than a mile. The average life expectancy of a kangaroo is about 4-6 years, with some living until they are about 23. They are large herbivores, feeding on grass and roots, and they chew cud. Because of its grazing, the kangaroo has developed specialized teeth. Its incisors are able to crop grass close to the ground, and its molars chop and grind the grass.
Facts about Kangaroos