Aotus vociferans

Spix's night monkey (Aotus vociferans) is a night monkey species from South America. It is found in Brazil, Colombia, Ecuador and Peru. The Spix's night monkey is a small bodied monkey species usually having a mass ofaround one kilogram. It belongs to the only nocturnal genus of New World primatesAotus. This type of monkey can leap farther than most due to it having longer arms thanlegs. The monkey averages 0.5 meters in height. The night monkey is considered to bea new world monkey. The social behavior of the Aotus vociferans is group based. These groupsusually consist of breeding pairs and their offspring. This species has amonogamous mating system. After the offspring are born, the fatherbecomes the main caretaker, only giving up the offspring for them to suckle. The offspring willusually stay with their birth group until they reach two and a half to three and a half yearsold. An exception to this if the male breeding partner is no longer present for any reason(usually only caused by death), then the offspring may stay with its birth group for onlytwelve weeks to the normal departure age. Social grooming in this species of monkey isuncommon. The Aotus vociferans reproduce usually by giving birth to one offspring. Although, like with humans, there are cases of twins. The female breeding partner carries the offspring in interbirth for around one year. Both mating and birthing occur between November andJanuary. For this species, copulation attempts tend to be short and quick, starting with the male and female approaching oneanother. Then the male performs a social sniff. During the original sniff, the female mayreciprocate but not always. Sexual intercourse usually consists of only threeto four thrusts by the male with him ejaculating on the final thrust.