Santa’s elves aren’t the only ‘little’ arrivals at Northern Ireland’s Belfast Zoo – twin Pygmy Marmosets, the world’s smallest monkey species, were born on November 14.

The twins are carried by their parents most of the time, but they’re becoming more adventurous by the day. 

Photo Credit:  Belfast Zoo

Pygmy Marmosets are one of the world’s smallest primates, with adults weighing four to five ounces (110-140g) when fully grown.  Native to South America’s upper Amazon basin, Pygmy Marmosets dwell in rain forests and feed primarily on tree gum.  Using specialized teeth, Marmosets gnaw on trees until sap is released, then lick up the sap.  They also feed on insects which are attracted to the sap, as well as fruits and nectar.