This set of BBC pictures shows babies of endangered species being carefully hand-reared in specialist facilities around the world.
The Coquerel's Sifaka, like all lemurs, is endemic to Madagascar. Madagascar is home to more than 250,000 (5% of the world's plant and animal) species of which 80% are found nowhere else on the globe (including six baobab species).
The Barbary Lion, originally from Morocco, is a Lion sub-species that became extinct in the wild in the 1940s.
The Aye-Aye is also a lemur, the world's largest nocturnal primate, native to Madagascar that combines rodent-like teeth and a special thin middle finger to fill the same ecological niche as a woodpecker.
The final image is an endearing picture of a baby elephant from Kenya's Dave Sheldrick Shelter.
