A Field Study of the Behavior and Social Relations of Howling Monkeys

activity adaptation adult females adult males apparently approached associated attempts avoid Barro Colorado Island become begin behave behavior believe branches capuchins carried cent clan clan males close complemental males conditioned continued coördination copulation crossing defensive described direction distance eaten example feeding feet field forest four frequently fruit function given ground hand howlers howling monkeys important indicate individuals infant instances juvenile kind later leaves limb located locomotion London lower means minutes months mother move movements notes observed occur Panama particular patterns period PLATE play population positions possible postures primary primates probably processes progression range reactions reference region relations relatively responses rest roars seconds seems seen sexual sexual activity shown similar situations specific stimulation subgrouping tail territory tion tongue tree usually vocalizations yards young animals