| behavioral and physiological responses to subgroup size and number of people in howler monkeys inhabiting a forest fragment used for nature-based tourism. | animals' responses to potentially threatening factors can provide important information for their conservation. group size and human presence are potentially threatening factors to primates inhabiting small reserves used for recreation. we tested these hypotheses by evaluating behavioral and physiological responses in two groups of mantled howler monkeys (alouatta palliata mexicana) at the "centro ecológico y recreativo el zapotal", a recreational forest reserve and zoo located in the mexican st ... | 2013 | 23801542 |