Weeping capuchins are similar in body size to small dogs, about 500 mm in length. The tail in this species is semiprehensile and is roughly the same length as the body, making an overall length of approximately 840 mm (Eisenberg and Redford, 1989).
Males and females generally weigh around 2.5 to 2.8 kg, but the males may weigh about 800 g more. The body is a mostly off-white to pale buff in color. The head is the same color as the body, but has a black to dark gray wedge-shaped patch extending from the forehead backwards over the cranium. The forearms also exhibit this dark black to gray color. The tail is black-tipped and is often carried coiled at the tip. This "ring-tail" is strong enough to support the entire body weight for long periods and is often used while feeding to free up the hands (Nowak, 1999).
Range mass: 1100 to 4300 g.
Average mass: 2500-2810 g.
Range length: 605 to 1120 mm.
Average length: 840 mm.
Other Physical Features: endothermic ; homoiothermic; bilateral symmetry
Sexual Dimorphism: male larger