Raemaekers J
Folia Primatol (Basel). 1980;34(1-2):46-60. doi: 10.1159/000155947.
The monthly medians of the distances traveled daily by siamang and lar gibbons are negatively correlated with rainfall and positively correlated with the separate and combined abundance of different food categories. The latter correlations indicate that the apes follow a policy of cutting their losses by reducing travel when food abundance falls.
合趾猿和白掌长臂猿每日出行距离的月中位数与降雨量呈负相关，与不同食物种类各自的丰度以及综合丰度呈正相关。后一种相关性表明，当食物丰度下降时，猿类会采取减少出行以减少损失的策略。
