Black-headed spider monkey

A. f. fusciceps lives in tropical and subtropical humid forests between above sea level. It lives in population densities of 1.2 monkeys per square kilometer. A. f. rufiventris lives in dry forests, humid forests and cloud forests, and can live up to above sea level. == Description ==

A. f. fusciceps has a black or brown body and a brown head. A. f. rufiventris is entirely black with some white on its chin. The black-headed spider monkey is one of the larger New World monkeys. The head and body length, excluding tail, typically ranges between . The prehensile tail is between . On average, males weigh and females weigh . Its brain weighs . == Diet ==

The Black spider monkey is primarily frugivorous, with the consumption of fruit consisting of about 80% of their diet. The remainder of its diet is omnivorous and consists of leaves, nuts, seeds, bark, insects, and flowers. == Behavior ==

The black-headed spider monkey is arboreal and diurnal. The species is highly sociable, living in social groups with up to 20 individuals but travels in smaller groupings. Most travel is done by brachiating and climbing through woodland areas. == Reproduction ==

When mating, females may consort with a male for up to three days, or else mate with several males. Mating occurs with the male and female face to face, and can last for five to 10 minutes. The gestation period is between 226 and 232 days. The infant rides on its mother's back for 16 weeks, and is weaned at 20 months. Females attain sexual maturity at 51 months; males at 56 months. Females give birth every three years. ==Gallery==

File:Ateles_fusciceps_robustus_moving.JPG|Ateles fusciceps rufiventris moving File:Ateles_fusciceps_robustus_water.JPG|A. f. rufiventris getting something out of the water ==References==