PHNOM TAMAO, Kandal Province – Now about six months old, Hope is still a little clumsy when climbing trees. Hope’s sidekick, named “173,” follows her around as if they were inseparable twins. Together, they swing in a hammock, bathe in a pool and, sometimes, climb up the metal bars of their enclosure to pull on the camera straps of adoring visitors. Though the smallest and most threatened of their kind, the two sun bear cubs are thriving.