von Hippel F A
Department of Earth and Environmental Sciences, Columbia University, Oracle, AZ 85623, USA.
Am J Primatol. 1998;45(3):281-90. doi: 10.1002/(SICI)1098-2345(1998)45:3<281::AID-AJP4>3.0.CO;2-S.
Groups of black and white colobus monkeys, or guerezas (Colobus guereza), observed in the Kakamega Forest, Kenya, had weak fidelity for sleeping sites. Groups often slept in trees near commonly used food sources, which might reduce the time and energetic costs of travel. Although the home range of each group overlapped with four to seven others, groups seemed to avoid sleeping near other groups, which would give them immediate and exclusive access to nearby food sources in the morning. The number of times a species of tree was slept in was positively correlated with its density. This may have occurred because so many suitable sites were available that proximity to feeding trees could be obtained whether or not groups slept in the feeding trees. Groups slept in tall trees, which provide stable sleeping sites and which may provide protection from both aerial and ground predators. Groups were more tightly clustered on nights with greater visibility, which might reduce the risk of predation.
在肯尼亚卡卡梅加森林中观察到的黑白疣猴群体，即东非黑白疣猴（Colobus guereza），对睡眠地点的忠诚度较低。群体通常睡在常用食物来源附近的树上，这可能会减少出行时间和精力消耗。尽管每个群体的活动范围与其他四到七个群体的活动范围重叠，但各群体似乎会避免在其他群体附近睡觉，这样它们就能在早上直接且独占附近的食物来源。一个树种被用作睡眠地点的次数与其密度呈正相关。这可能是因为有如此多合适的地点可供选择，以至于无论群体是否睡在觅食树上，都能靠近觅食树。群体睡在高大的树上，这些树提供了稳定的睡眠地点，还可能提供对空中和地面捕食者的保护。在能见度较高的夜晚，群体聚集得更紧密，这可能会降低被捕食的风险。
