They have nails. The arms and legs are equal length. The Lincoln Park Zoo exhibit differs from its natural environment but is being upgraded.
The New World Monkeys appear to be more prominently displayed.
The following species are featured in the Lincoln Park Zoo primate exhibit, including:
a. Allens swamp monkey (catarrhine, Allenopithecus nigroviridis, arboreal (tree-dwelling) but semi-terrestrial.)
b. Black howler monkey (platyrrhine, Alouatta caraya, rain forests with near constant precipitation to tropical deciduous forest)
c. Black-and-white colobus (catarrhine, Colobus guereza, tropical forests, woodlands and wooded grassland, lowlands and at high elevations)
d. Bolivian gray titi monkey (platyrrhine, Callicebus donacophilus, rain forest habitats, among the trees)
e. De Brazzas monkey (platyrrhine, Cercopithecus neglectus, wetland forests within 1 mile of water)
f. Francois langur (catarrhine, Trachypithecus francoisi, canopy in search of leaves on which to feed)
g. Geoffreys marmoset (platyrrhine, Callithrix geoffroyi, dry patches within forests and forest edges.)
h. Goeldis monkey (platyrrhine, Callimico goeldii, rain forest with developed undergrowth.)
i. Pied tamarin (platyrrhine, Saguinus bicolor, upper parts of trees within forests and swamps.)
j. White-cheeked gibbon (platyrrhine, Hylobates concolor leucogenys, High canopy of tropical rain forests)
Part II. Compare and Contrast
1. Old World monkeys are less arboreal that New World monkeys who are confined to trees, such as the Bolivian gray titi monkey.
New World monkeys use their tail much more than Old World monkeys to the point that it functions and is as useful as a fifth limb. Old World monkeys appear to have greater size than New World monkeys.
2. The arboreality of gibbons was much more vs. The Great Apes. This was especially due to the apparent lack of knuckle walking on the part of gibbons. Great Ape arboreality was definitely most visible in females and/or their infants.
3. Chimps seem to be much more active than gorillas. Gorillas in my opinion tended to stay together more as a group, especially the females around the alpha male .Immature chimps use a lot more area in terms of vertical and horizontal locomotion,
Part III. Interaction
The 2 platyrrhine species and well as the 2 ceropithecoid species do not appear to be antagonistic toward each other. When the author was there, they appeared to ignore each other. They kept to themselves and their normal substrates in the cerepithecoid exhibit but in the platyrrhine exhibit Allens swamp monkey stayed more on the ground while the black colubus was more arboreal.
1. The gorillas were engaged in birthday enrichment. This author has never seen a zoo do this before.
2. We are.