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. Allen's 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 Brazza's 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. Geoffrey's marmoset (platyrrhine, Callithrix geoffroyi, dry patches within forests and forest edges.)...
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