This paper presents field observations of six primate species at a university zoo exhibit, examining morphological characteristics, locomotion, sexual dimorphism, and habitat comparisons. The study covers Allen's swamp monkey, François' langur, Bolivian gray titi monkey, white-cheeked gibbon, chimpanzee, and gorilla. It further compares New World (platyrrhine) and Old World (catarrhine) monkeys in terms of arboreality and tail use, contrasts gibbon and Great Ape locomotion, and notes behavioral differences between chimpanzees and gorillas. Interspecies interaction and enrichment activities are also briefly discussed. The observations highlight how captive environments differ from natural habitats and illuminate key distinctions across primate taxa.
Allen's Swamp Monkey: The genitalia are unpronounced, and estrus, menses, and breeding season are unknown. The male appears to be larger, indicating sexual dimorphism, though there are no apparent differences in coat color. The species is a quadruped with longer arms. The thumbs and big toes are opposable. It appears to have nails and only a small tail, which it seems to use similarly in captivity as in the wild. The species spends considerable time on the ground in its natural habitat. The zoo exhibit differs from its natural environment.
François' Langur: The species does not appear to be sexually dimorphic, and genitalia are unpronounced, with little difference in coat color. The species is primarily arboreal, and males do not appear to be noticeably larger. Arms are longer, and the species is a quadruped. The thumbs and big toes are opposable. It has nails and a small tail, which it appears to use similarly in captivity as in the wild. The zoo exhibit differs from its natural environment, though it is set up with some similarity to the species' natural habitat.
Bolivian Gray Titi Monkey: The species does not appear to be sexually dimorphic. It has fingernails on the toes only. It possesses a prehensile tail and is arboreal, appearing to use its tail in captivity as it does in the wild. The genitalia appear to be unpronounced. The zoo exhibit is set up similarly to its natural environment.
White-Cheeked Gibbon: The gibbon has no tail, as it is a lesser ape. It is mainly arboreal, and the thumbs are not as opposable as those of a human. The genitalia appear to be unpronounced, and the species does not appear to be sexually dimorphic. They have nails, and their arms are notably longer than their legs. The zoo exhibit differs from its natural environment.
Chimpanzee: The chimpanzee is both terrestrial and arboreal. The thumbs are not as opposable as those of a human. The genitalia appear to be unpronounced. The species does appear to be sexually dimorphic. They have nails, and the arms and legs are approximately equal in length. The zoo exhibit differs from its natural environment.
Gorilla: Gorillas are mainly terrestrial. The thumbs are not as opposable as those of a human. The genitalia appear to be unpronounced. The species does appear to be sexually dimorphic. They have nails, and the arms and legs are approximately equal in length. The zoo exhibit differs from its natural environment but is currently being upgraded.
New World monkeys appear to be more prominently displayed in the exhibit. The following species are featured, along with their taxonomic classification and natural habitats:
a. Allen's Swamp Monkey (Allenopithecus nigroviridis; catarrhine) — arboreal but semi-terrestrial.
b. Black Howler Monkey (Alouatta caraya; platyrrhine) — rain forests with near-constant precipitation to tropical deciduous forest.
c. Black-and-White Colobus (Colobus guereza; catarrhine) — tropical forests, woodlands, and wooded grassland, from lowlands to high elevations.
d. Bolivian Gray Titi Monkey (Callicebus donacophilus; platyrrhine) — rain forest habitats, among the trees.
e. De Brazza's Monkey (Cercopithecus neglectus; platyrrhine) — wetland forests within one mile of water.
f. François' Langur (Trachypithecus francoisi francoisi; catarrhine) — forest canopy, in search of leaves on which to feed.
g. Geoffrey's Marmoset (Callithrix geoffroyi; platyrrhine) — dry patches within forests and forest edges.
h. Goeldi's Monkey (Callimico goeldii; platyrrhine) — rain forest with developed undergrowth.
i. Pied Tamarin (Saguinus bicolor; platyrrhine) — upper parts of trees within forests and swamps.
j. White-Cheeked Gibbon (Hylobates concolor leucogenys; platyrrhine) — high canopy of tropical rain forests.
Old World monkeys are less arboreal than New World monkeys, which are largely confined to the trees — as exemplified by the Bolivian gray titi monkey. New World monkeys use their tails far more than Old World monkeys, to the point that the tail functions effectively as a fifth limb. Old World monkeys also appear to attain greater overall body size than their New World counterparts.
"Locomotion and arboreality contrasts"
"Social behavior in mixed-species enclosures"
"Enrichment activity and human-chimp similarity"
You’re 76% through this paper. Sign up to read the remaining 3 sections.
Sign Up Now — Instant Access Already a member? Log inAlways verify citation format against your institution’s current style guide requirements.