The four adorable cubs are doing well and weigh about 4.5 pounds each.
This will be the seventh pygmy marmoset at Vienna Zoo, which aims to protect the vulnerable species.
Pandas Yang Yang and Yuan Yuan failed to mate at the Vienna Zoo, but zookeepers are hopeful next year may bring better results.
Though currently closed to visitors, the Vienna Zoo announced the birth of a ring-tailed lemur.
Finja is too busy playing with her yellow buoy to even notice that there are no humans around.