1. Newborn babies are tiny jellybeans. A baby kangaroo (called a joey) is born when it's only about the size of a single jellybean—less than one inch long! It crawls up its mom's fur all by itself to get inside her cozy pouch.

2. They can't walk backward. Because of their massive feet and thick, heavy tails, kangaroos cannot walk or hop backward easily. Australia put the kangaroo on its official coat of arms to symbolize always moving forward!

3. Their tail is like a fifth leg. When walking around slowly to graze on grass, kangaroos use their muscular tail like an extra leg to push off the ground while moving their big hind feet.

4. They can leap higher than a house door. A large Red Kangaroo can clear a jump over 25 feet (8 meters) in a single hop and can jump up to 10 feet high!

5. A group is called a mob. A family or herd of kangaroos isn't called a flock or pack—it is officially called a mob, a court, or a troop.

6. Male kangaroos show off their muscles. Big male kangaroos (nicknamed "boomers" or "jack-rabbits") will lean back on their tails, flex their arm muscles, and boxing-fight each other to impress female kangaroos ("flyers").

7. They are excellent swimmers. Kangaroos aren't just land hoppers—they are fantastic swimmers! They use their powerful hind legs to paddle through deep rivers and lakes to escape predators.