The red kangaroo usually is about 5 to 6 feet long and weighs around 120 to 200 pounds, which makes the red kangaroo the largest marsupial of all time. This kangaroo is as fast as lightning, it can travel up to 43 miles per hour and can jump over 6 feet into the air. Due to the hot climates of Australia, they have a unique way of cooling themself down which is licking their forearms because they lack conventional sweat glands.