The common marmoset (Callithrix Jacchus) is classed as a New World monkey. It originally lived on the North-eastern coast of Brazil; however release of captive individuals has expanded its range to include Southeast Brazil. They are very small monkeys with relatively long tails. Males have an average height of 188 mm (7.40 in) and females have an average height of 185 mm (7.28 in). Males weigh 256 g (9.03 oz) on average and females weigh 236 g (8.32 oz) on average.
The common marmosets have claw-like nails on most of their fingers, with only their big toes having the flat nails that most other primates have. These nails, the shape of their incisors, and their specialist gut help their unique diet of gum, sap, latex and resins. They use their nails to cling to the side of a tree and, with their long lower incisors, chew a hole in the tree bark. They will then lick up the exudates.
Above information taken from Wikipedia.
You can see this typical feeding behaviour, as well as see them catching and eating insects and the occasional small bird, when visiting these marmosets at Longleat. They also enjoy the meal worms and sweet corn that the handlers use as treats to tempt them out into the viewing enclosure.
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