As The Ark unfolds, it expands to include our second group of main characters: the Ol Pejeta Conservancy’s rhino bodyguard team. The team is a well-armed, well-trained group of park rangers tasked with protecting Kenya’s three northern white rhinos from poachers. These rangers stay alongside the herd 7 days a week, 24 hours a day, and even go so far as to sleep next to the animals. Among the rhinos they protect is Sudan, the last male northern white rhino—and the last chance for the species to reproduce through natural methods.