Zoo Tycoon: Ultimate Animal Collection

This is easier than it sounds. There are only 4 animals to breed here and they are just the 4 different types of Kangaroo. In my experience it is easier to breed them if you put them in a large outback enclosure with 3 males and 3 females. You will increase your chances of breeding successfully by making them happy with their enclosure. Also researching "Top Cat" and "Lion-el Richie" increase the chances of animals breeding. And also adding an animal breeding expert from the animal breeding centre will increase the odds of a successful breed. I have found kangaroos to be very easy to breed with way.