A baby kangaroo is also referred to as a joey. An adult female kangaroo is sometimes called a flyer, while an adult male is known as a boomer.
Forty different species of kangaroos exist, with the wallaby being the smallest and the red kangaroo being the largest. When the red kangaroo stands upright it is usually more than 6 1/2 feet tall, with a typical weight of around 185 pounds. The word kangaroo was first used in 1770 in the diary of Sir Joseph Banks. Banks was an English botanist, who enjoyed collecting plants from around the world.
The name kangaroo has an interesting story behind it. When the first explorers from Europe arrived in Australia, they asked the native Aborigine people for the name of the animal. The natives did not understand their question, so they relied "Kangaroo," which means "I don't understand," and the name stuck because explorers believed it to be its name.
Kangaroos are marsupials, and there are more than 40 species of kangaroo in the world.