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Author |
Wilson, A.M.; McGuigan, M.P.; Su, A.; van Den Bogert, A.J. |
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Title |
Horses damp the spring in their step |
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Journal Article |
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Year |
2001 |
Publication |
Nature |
Abbreviated Journal |
Nature |
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Volume |
414 |
Issue |
6866 |
Pages |
895-899 |
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Keywords |
Animals; Biomechanics; Elasticity; Forelimb; Gait; Horses/anatomy & histology/*physiology; Leg Bones/*physiology; Locomotion; Models, Biological; Muscle Fibers/physiology; Muscle, Skeletal/anatomy & histology/*physiology; Tendons/anatomy & histology/*physiology; Vibration |
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Abstract |
The muscular work of galloping in horses is halved by storing and returning elastic strain energy in spring-like muscle-tendon units.These make the legs act like a child's pogo stick that is tuned to stretch and recoil at 2.5 strides per second. This mechanism is optimized by unique musculoskeletal adaptations: the digital flexor muscles have extremely short fibres and significant passive properties, whereas the tendons are very long and span several joints. Length change occurs by a stretching of the spring-like digital flexor tendons rather than through energetically expensive length changes in the muscle. Despite being apparently redundant for such a mechanism, the muscle fibres in the digital flexors are well developed. Here we show that the mechanical arrangement of the elastic leg permits it to vibrate at a higher frequency of 30-40 Hz that could cause fatigue damage to tendon and bone. Furthermore, we show that the digital flexor muscles have minimal ability to contribute to or regulate significantly the 2.5-Hz cycle of movement, but are ideally arranged to damp these high-frequency oscillations in the limb. |
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Department of Veterinary Basic Sciences, The Royal Veterinary College, Hatfield, Herts AL9 7TA, UK. awilson@rvc.ac.uk |
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0028-0836 |
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PMID:11780059 |
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Call Number |
Equine Behaviour @ team @ |
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2300 |
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Author |
Whiten, A.; McGrew, W.C. |
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Title |
Is this the first portrayal of tool use by a chimp? |
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Year |
2001 |
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Nature |
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Nature |
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Volume |
409 |
Issue |
6816 |
Pages |
12 |
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Keywords |
Animals; *Behavior, Animal; Pan troglodytes/*physiology; Philately |
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0028-0836 |
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PMID:11343083 |
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refbase @ user @ |
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739 |
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Author |
de Waal, F.B.; Berger, M.L. |
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Title |
Payment for labour in monkeys |
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Journal Article |
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Year |
2000 |
Publication |
Nature |
Abbreviated Journal |
Nature |
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Volume |
404 |
Issue |
6778 |
Pages |
563 |
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Keywords |
Animals; Cebus/*physiology; *Cooperative Behavior; Evolution; *Feeding Behavior; Female; Male; Reward |
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Living Links, Yerkes Regional Primate Research Center, and Department of Psychology, Emory University, Atlanta, Georgia 30329, USA. dewaal@emory.edu |
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0028-0836 |
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PMID:10766228 |
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refbase @ user @ |
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190 |
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Author |
Whiten, A.; Goodall, J.; McGrew, W.C.; Nishida, T.; Reynolds, V.; Sugiyama, Y.; Tutin, C.E.; Wrangham, R.W.; Boesch, C. |
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Title |
Cultures in chimpanzees |
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Journal Article |
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Year |
1999 |
Publication |
Nature |
Abbreviated Journal |
Nature |
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Volume |
399 |
Issue |
6737 |
Pages |
682-685 |
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Keywords |
Animals; *Behavior, Animal; Cognition; *Culture; Humans; Pan troglodytes/*physiology; Species Specificity |
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Abstract |
As an increasing number of field studies of chimpanzees (Pan troglodytes) have achieved long-term status across Africa, differences in the behavioural repertoires described have become apparent that suggest there is significant cultural variation. Here we present a systematic synthesis of this information from the seven most long-term studies, which together have accumulated 151 years of chimpanzee observation. This comprehensive analysis reveals patterns of variation that are far more extensive than have previously been documented for any animal species except humans. We find that 39 different behaviour patterns, including tool usage, grooming and courtship behaviours, are customary or habitual in some communities but are absent in others where ecological explanations have been discounted. Among mammalian and avian species, cultural variation has previously been identified only for single behaviour patterns, such as the local dialects of song-birds. The extensive, multiple variations now documented for chimpanzees are thus without parallel. Moreover, the combined repertoire of these behaviour patterns in each chimpanzee community is itself highly distinctive, a phenomenon characteristic of human cultures but previously unrecognised in non-human species. |
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Scottish Primate Research Group, School of Psychology, University of St Andrews, UK |
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0028-0836 |
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PMID:10385119 |
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refbase @ user @ |
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742 |
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Author |
Parr, L.A.; de Waal, F.B. |
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Title |
Visual kin recognition in chimpanzees |
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Year |
1999 |
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Nature |
Abbreviated Journal |
Nature |
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Volume |
399 |
Issue |
6737 |
Pages |
647-648 |
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Keywords |
Animals; *Behavior, Animal; Face; Female; Male; Pan troglodytes/*physiology |
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0028-0836 |
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PMID:10385114 |
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no |
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Call Number |
refbase @ user @ |
Serial |
195 |
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Author |
de Waal, F.B. |
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Title |
Cultural primatology comes of age |
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Journal Article |
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Year |
1999 |
Publication |
Nature |
Abbreviated Journal |
Nature |
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Volume |
399 |
Issue |
6737 |
Pages |
635-636 |
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Keywords |
Animals; *Behavior, Animal; *Culture; Humans; Pan troglodytes/*physiology |
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0028-0836 |
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PMID:10385107 |
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refbase @ user @ |
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196 |
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Author |
Eisenmann V, |
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Title |
Le cheval: Passé, présent et avenir. |
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Year |
1982 |
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Bull Inf Mus Nat Hist Naturelle |
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30 |
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29-34 |
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from Professor Hans Klingels Equine Reference List |
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no |
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1052 |
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Author |
Ewart Jc, |
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Title |
The wild horse |
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Journal Article |
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Year |
1903 |
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Nature |
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68 |
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271-274 |
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from Professor Hans Klingels Equine Reference List |
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1076 |
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Author |
Fedak Ma, S.H. |
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Title |
Reappraisal of energetics of locomotion shows identical cost in bipeds and quadrupeds including ostrich and horse |
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1979 |
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Nature |
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282 |
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713-716 |
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from Professor Hans Klingels Equine Reference List |
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no |
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1079 |
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Author |
Hoyt Df, T.C. |
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Title |
Gait and the energetics of locomotion in horses |
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Year |
1981 |
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Nature |
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292 |
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239-240 |
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from Professor Hans Klingels Equine Reference List |
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1205 |
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