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Night monkeys have monochromatic vision which improves their ability to detect visual cues at night. Night monkeys are threatened by habitat loss, the pet trade, hunting for bushmeat, and by biomedical research.
Night monkeys have several adaptations that enable their nocturnal lifestyle. They possess large eyes with a high density of rod cells, enhancing their night vision. Their retinas are specialized for low-light conditions, allowing them to navigate and forage in the dark.
Nov 18, 2022 · We propose that the selective expansion of sensory areas dedicated to visual motion and auditory processing in night monkeys may reflect cortical adaptations to a nocturnal environment. Night monkeys (Aotus) are the only genus of monkeys within the Simian lineage that successfully occupy a nocturnal environmental niche.
There are eight species of night monkeys, also commonly called douroucoulis or owl monkeys, found from Panama to Peru, Bolivia, and northeastern Argentina. Douroucoulis are the only nocturnal monkeys in the New World.
- Activity Patterns
- Diet
- Home Range and CORE Area
- Distance Traveled Per Night
From the systematic monitoring of four groups of night monkeys over a period of approximately 1 yr, in two different tropical ecosystems, we found that these nocturnal primates spend a large proportion of the night resting. Night monkeys in lowland and highland forests had very similar use of time. These results suggest that night monkeys in tropic...
We found that night monkeys rely heavily on ripe fruits, and all study groups spent >60% of the feeding time eating fruits. Similar results have been reported for other groups of Aotus lemurinus (Castaño et al. 2010; Guzmán et al. 2016) and for other species of night monkeys such as A. azarae (Arditi 1992; Fernandez-Duque and van der Heide 2013) an...
The night monkeys have high behavioral plasticity and can be found in many types of forests, from highlands to lowlands, and from relatively undisturbed to heavily disturbed forest (Castaño et al. 2010; Defler 2010; Montilla et al. 2018). Home ranges range from 17.5 ha for Aotus brumbacki in Tinigua National Park in Colombia (estimated using minimu...
The distances traveled per night by the four study groups are partially consistent with the results of other studies of night monkeys. Nightly distances reported so far range from 252 m in Aotus nigriceps to 854 m in A. lemurinus (Castaño et al. 2010; Fernandez-Duque et al. 2008; Solano 1995). The distances we recorded for A. lemurinus groups CO1 (...
- Sebastián O. Montilla, Alex Mauricio Mopán-Chilito, Laura Natalia Sierra Murcia, Jonathan David Mahe...
- 2021
Night monkeys, however, have uniquely adapted to be highly successful in this niche. Because they prefer warmer temperatures, night monkeys avoid foraging on colder moonless nights and are more active when the moon is bright.
Nov 18, 2022 · Our results show that the night monkey cerebral cortex has a qualitatively similar but quantitatively different pattern of cortical myelin compared to the diurnal macaque and marmoset monkeys.
