Published Wednesday, 18 December 2013
The animals are settling in to their surroundings at Belfast Zoo. (© Belfast Zoo)
The twin pygmy marmosets - which are the tiniest members of the primate family - arrived on 14 November.
They will weigh between four and five ounces fully grown.
Delighted zoo manager Mark Challis said: "Our gorilla house is home to both the largest and smallest primates in the world, demonstrating the vast difference between the two.
"2013 has been an exciting year in the gorilla house as we welcomed Baako, the first Western lowland gorilla to be born here in 16 years, and we are now celebrating the arrival of our tiny twin pygmy marmosets!
"The twins are carried by their parents but are becoming increasingly adventurous and are beginning to venture off the parents' backs to explore their surroundings."
Pygmy marmosets are found in the tropical forests of the upper Amazon basin and the main threats facing pygmy marmosets are habitat destruction and the pet trade.
The zoo has encouraged people to support the animals by joining its adoption scheme.
© UTV News