Two Geoffroy's Marmosets were born to parents Yao and Iris at the Henry Vilas Zoo Wednesday.
Geoffroy's Marmosets are native to Eastern Brazilian Rain Forests, and have mostly black and brown fur, though their faces, foreheads and cheeks are white.
The National Association of Zoos and Aquariums' Marmoset Species Survival Plan, which help sustain marmoset populations, recommended Yao and Iris' mating.
""This is a significant birth of an endangered species,"" Zoo Director Jim Hubing said in a statement. ""It is a privilege to participate in this important conversation initiative.""
Both babies are doing well, according to Tropical Rain Forest Aviary keeper Laura Reisse. She said the babies cling to their mother most of the time and are never out of the mother's sight.