Lion Tamarins.

Lion tamarins have a mane derived from long hairs on the top of the head, cheeks and throat. The golden lion tamarin's color is predominantly golden with occasional orange, brown or black coloration on the tail and forepaws. It weighs about 0.5 kg (1.1 lb) and averages about 25 cm (10") in head/body length, not counting the tail.
The golden lion tamarin prefers primary lowland tropical forest from sea level to 1000 m (3300'). Golden lion tamarins are omnivorous, feeding on fruits, gum, nectar, insects, and small vertebrates. The golden lion tamarin is diurnal and predominantly arboreal. It is usually found at heights of 3 - 10 m (10 - 30') above the forest floor. It sleeps there at night in tangled vegetation or, more often, in a hole in a tree, such as an abandoned woodpecker nest.