===Reproduction===
Male kangaroos will go around the mob checking the females’ [[cloaca]]. Many times, males are rejected by the females because of size if they are small. In other cases, if a larger male is checking a female out, she may just move away. Sometimes, when a male is checking out a female, the female will urinate for the male, who will sniff the urine. Some studies show that this ritual is for the male to see if the female kangaroo is receptive to him or not.
If the female is responsive to the male, she raises her tail and the male will follow her. Sometimes the kangaroos will scratch each other’s tails or the male will give the female a back rub before mating. When the female is ready to mate she will arch her tail.
Female kangaroos usually only have one baby kangaroo (called a "joey") at a time. The newborn joey weigh as little as .03 ounces when first born, after which it crawls into its mothers pouch where it will nurse, grow, and develop. They spend a lot of time in their mothers pouch developing. The Red Kangaroo joey will stay in their mothers pouch for about eight months and Grey Kangaroo joeys stay in there for about a year.
===Development of the Young in the Pouch===
