A baby kangaroo is called a joey. The adult male kangaroos are called bucks, boomers or jacks. Adult females are known as does, flyers or jills.
According to Live Science, kangaroos are marsupials, meaning they give birth to young who are not fully developed. A newborn joey is often barely bigger than a grain of rice. The joey continues to grow inside the mother's pouch where it gains nourishment from milk and where it is sheltered and kept warm and protected for 120 to 400 days. A kangaroo grows to a height of 3 to 8 feet. Kangaroos travel together in a "mob" that ranges from 10 to over 100 kangaroos. If there is more than one male in a mob, they compete for dominance by boxing. Kangaroos are native to Australia, but they are adaptable to other climates.