Meet Philadelphia Zoo’s Black-and-white Ruffed Lemurs, born on February 21.  Together, these four fluffy babies weigh only one-third of a pound, but they add up to a ton of cuteness. 

The babies were born to 9-year-old Kiaka and 10-year-old Huey after a breeding recommendation by the Association of Zoos and Aquariums' Species Survival Plan.  This program seeks to maintain genetically viable populations of rare and endangered animals.  Because of her genetic makeup, Kiaka is the most valuable breeding female of her species in the country.

Photo Credit:  Philadelphia Zoo

An excellent mother, Kiaka carries the babies in her mouth from one nest box to another, a typical behavior as the babies cannot move around on their own for the first few months. The siblings will nurse until they are about five to six months old, but will try solid foods at six to eight weeks of age.

Native to Madagascar, Black-and-white Ruffed Lemurs are listed as Critically Endangered by the International Union for Conservation of Nature  due to poaching and habitat loss.