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Biol Lett. 2014 Aug;10(8). pii: 20140434. doi: 10.1098/rsbl.2014.0434.

Gripping during climbing of arboreal snakes may be safe but not economical.

Author information

1
Department of Biology, Siena College, 515 Loudon Road, Loudonville, NY 12211, USA gbyrnes@siena.edu.
2
Department of Biological Sciences, University of Cincinnati, PO Box 210006, Cincinnati, OH 45221-0006, USA.

Abstract

On the steep surfaces that are common in arboreal environments, many types of animals without claws or adhesive structures must use muscular force to generate sufficient normal force to prevent slipping and climb successfully. Unlike many limbed arboreal animals that have discrete gripping regions on the feet, the elongate bodies of snakes allow for considerable modulation of both the size and orientation of the gripping region. We quantified the gripping forces of snakes climbing a vertical cylinder to determine the extent to which their force production favoured economy or safety. Our sample included four boid species and one colubrid. Nearly all of the gripping forces that we observed for each snake exceeded our estimate of the minimum required, and snakes commonly produced more than three times the normal force required to support their body weight. This suggests that a large safety factor to avoid slipping and falling is more important than locomotor economy.

KEYWORDS:

gripping pressure; locomotion; normal force; prehensile; safety factor

PMID:
25142200
PMCID:
PMC4155911
DOI:
10.1098/rsbl.2014.0434
[Indexed for MEDLINE]
Free PMC Article

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