22-month-old male Goodfellow's tree-kangaroo Makaia is fed by a staff member of the Singapore Zoo in Singapore, on Aug. 3, 2016. Two more tree kangaroos settled down in Singapore Zoo on Wednesday, making the zoo a home of four tree kangaroos in total. They now live in the newly opened Goodfellow's tree kangaroo exhibit at the Australasian Zone. Tree kangaroos stand among the rarest animals kept under human care, with only approximately 50 in zoos around the world. The recent arrivals are Makaia and Nupela, who are selected as a couple to enhance the sustainability of the global population of this species. (Xinhua/Then Chih Wey)
