Watch Sex in the Wild

Reidenberg heads to New Zealand to examine the mating strategies and anatomies of dusky dolphins, who form groups to mate that leap from the water in unison. Males pursue females and rapidly mate in just two seconds. Watch a dolphin birth and learn how breastfeeding underwater is difficult.

The scientists follow a joey kangaroo's birth and its development. In Brisbane, to conserve koala's they use artificial insemination to boost the numbers of koala babies. Reidenberg visits University of Adelaide to find out about a pioneering breeding program to learn about preservation efforts to save the endangered southern brush-tailed rock-wallaby in South Australia.

Evans and Reidenberg travel to a sanctuary for orangutans in the Borneo rainforest to learn about reproduction challenges of orangutans. The team looks into how the alpha male "kings" have power over other males and seduce females in their territory. Devoting seven years to raising an orangutan baby is key to the species success.

Evans and Reidenberg follow pregnant female elephant Kiti, through her baby's birth. Evans travels with a group to trying to control the elephant population, while maintaining genetic diversity, through chemical birth control as Botswana deals with increasing numbers of animals.