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Ross, Callum F.
- How Capuchin Monkeys Use Their Semi-Prehensile Tails
Abstract Views :180 |
PDF Views:99
Authors
Madhur Mangalam
1,
Callum F. Ross
2,
Patrícia Izar
3,
Elisabetta Visalberghi
4,
Dorothy M. Fragaszy
5
Affiliations
1 Department of Physical Therapy, Movement and Rehabilitation Sciences, Northeastern University, Boston, MA 02115, US
2 Department of Organismal and Evolutionary Biology, University of Chicago, Chicago, IL 60637, US
3 Department of Psychology, University of São Paulo, São Paulo 05508-020, BR
4 Institute of Cognitive Sciences and Technologies, National Research Council, 44-00185 Rome, IT
5 Department of Psychology, University of Georgia, Athens, GA 30602, US
1 Department of Physical Therapy, Movement and Rehabilitation Sciences, Northeastern University, Boston, MA 02115, US
2 Department of Organismal and Evolutionary Biology, University of Chicago, Chicago, IL 60637, US
3 Department of Psychology, University of São Paulo, São Paulo 05508-020, BR
4 Institute of Cognitive Sciences and Technologies, National Research Council, 44-00185 Rome, IT
5 Department of Psychology, University of Georgia, Athens, GA 30602, US
Source
Current Science, Vol 122, No 2 (2022), Pagination: 195-200Abstract
Among primates, prehensile/semi-prehensile tails have evolved independently in the families Atelidae and Cebidae of the infraorder Platyrrhini (Neotropical monkeys). They facilitate maintaining stability during locomotion on thin, flexible branches and while reaching for food on challenging substrates. How a prehensile/semi-prehensile tail is coordinated with the hind limbs to facilitate controlled, flexible adoption of postures remains unknown. In an experimental set-up in the wild, we induced capuchin monkeys to adopt a tail-assisted, head-down tripodal posture to reach for food, documenting from slow-motion video recordings (120 fps) both qualitative changes in the monkeys’ positional behaviour – the relative orientation of their limbs and semi-prehensile tail – and quantitative changes in the left knee angle. The monkeys coordinated their tail and hind limbs in an online manner by preparing to anchor the tail over a substrate when beginning to adopt a tail-assisted, head-down, tripodal posture, but anchoring it only at the moment when they extended their hand to grasp the food. Coordination of their semi-prehensile tail with their limbs enables these capuchin monkeys to adjust their posture more flexibly compared to anchoring their tail over a substrate in anticipation and subsequently changing posture.Keywords
Left Knee Angle, Locomotion, Prehensility, Sapajus libidinosus, Tail Cantilever Length, Tropodal Posture.Full Text
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