The joey is born alive. The kangaroo has lungs and breathes oxygen from the air. The joey drinks milk inside its mother's pouch. The kangaroo is related to the koala . This is how the red and gray kangaroo are different.
Kangaroos are red, gray, brown, and tan.
Kangaroos have fur for a coating. The gray and red kangaroo are both 5 feet tall. The gray kangaroo weighs up to 200 pounds. The red kangaroo usually weighs up to 120 pounds. The male red kangaroo weighs 180 pounds.