The Red-bellied titi[1] (Plecturocebus moloch) is a marmoset species of New World monkey native to Brazil. It lives in thickets and forests.
- The Red-bellied titi has a normal head and body length of 33.3 cm (13.1 in) for males and 33.1 cm (13.0 in) for females and shows no sexual dimorphism.
- Its tail is longer than its head and body combined. Males weigh between 850 and 1, 200 g (1.87 and 2.65 lb), while females weigh between 700 and 1, 020 g (1.54 and 2.25 lb).
- The Red-bellied titi has a pollex larger than its hallux. It has 6 palmar pads and nails on each of its 5 digits.
- It has relatively large ears, often obscured by the fur on the side of the head. The nose has a wide internal septum, and the nostrils open laterally.
- The fur on the back can be brown, reddish, or gray in adults. It usually has white or black bands on its forehead. This color pattern is found in juveniles and adults.