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Author |
Bannikov, A.G. |
Title |
The Asiatic Wild Ass: neglected relative of the horse |
Type |
Journal Article |
Year |
1971 |
Publication |
Animals |
Abbreviated Journal |
Animals |
Volume |
13 |
Issue |
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580-585 |
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Englisch |
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refbase @ user @ |
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756 |
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Author |
Clutton-Brock, T.H.; Parker, G.A. |
Title |
Sexual coercion in animal societies |
Type |
Journal Article |
Year |
1995 |
Publication |
Animal Behaviour. |
Abbreviated Journal |
Anim. Behav. |
Volume |
49 |
Issue |
5 |
Pages |
1345-1365 |
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Abstract |
In a wide range of animal species, males coerce females to mate with them, either by physically forcing them to mate, by harassing them until they mate or by punishing persistent refusal to mate. The first section of this paper argues that the possibility of forced copulation can generate arms races between males and females that may have substantial costs to both sexes. In the second section, it is suggested that sexual harassment commonly represents a `war of attrition' between the sexes; existing game theory models that may apply to sexual conflict over mating decisions are reviewed. The third section develops a simple prospective model for the evolution of intimidation by punishment in situations where males can raise the probability that females will accept their advances in future by punishing them for refusal to mate. Where the benefits of sexual coercion to males are high, all three male strategies may develop to a point where they have substantial costs to females. In the final section, evidence that female behaviour is adapted to minimizing these costs is reviewed. |
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757 |
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Bahloul, K.; Pereladova, O.B.; Soldatova, N.; Fisenko, G.; Sidorenko, E.; Sempere, A.J. |
Title |
Social organization and dispersion of introduced kulans (Equus hemionus kulan) and Przewalski horses (Equus przewalski) in the Bukhara Reserve, Uzbekistan |
Type |
Journal Article |
Year |
2001 |
Publication |
Journal of Arid Environments |
Abbreviated Journal |
J. Arid. Environ. |
Volume |
47 |
Issue |
3 |
Pages |
309-323 |
Keywords |
Przewalski horses; kulans; Central Asia; home range; behaviour |
Abstract |
Asiatic wild asses and Przewalski horses initially inhabited steppe, semi-desert and desert areas, but Przewalski horses became extinct in the wild, and kulans disappeared at the beginning of the 20th century, except for a small population in Turkmenistan. The Bukhara Breeding Centre (Uzbekistan) was created in 1976 for reintroduction and conservation of wild ungulate species. In 1977-1978, five kulans (two males and three females), from Barsa-Kelmes island on the Aral sea, were introduced into the reserve. The group increased to 25-30 animals in 1989-1990, when eight Przewalski horses from Moscow and St Petersburg zoos were introduced. We analysed the home ranges, preferred habitats and social interactions of these closely related species during 1995-1998 by seasonal and group composition. Horses and asses formed a reproductive group and a secondary non-reproductive group. The home range of the secondary group was larger than the reproductive group and seemed to be less dependent from the watering places. Przewalski horses were less adapted to semi-desert conditions (both water and vegetation needs) than kulan. |
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refbase @ user @ |
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777 |
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Tilson, R.L.; Sweeny, K.A.; Binczik, G.A.; Reindl, N.J. |
Title |
Buddies and bullies: Social structure of a bachelor group of Przewalski horses |
Type |
Journal Article |
Year |
1988 |
Publication |
Applied Animal Behaviour Science |
Abbreviated Journal |
Appl. Anim. Behav. Sci. |
Volume |
21 |
Issue |
1-2 |
Pages |
169-185 |
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Abstract |
The Minnesota Zoological Garden established a bachelor (i.e. all-male) group of 8 Przewalski horses (Equus przewalskii) in 1984. Possible methods for mixing males emerged through preliminary introductions and review of the relevant literature. These included: (1) grouping colts (<=3 years old) after removing them from their natal bands; (2) introducing adult stallions to colts in spacious, controlled environments to reduce the risk of combat-related injury or death associated with largely unpredictable adult temperament; (3) introducing more than 1 animal at a time to established groups. Based on the frequency and orientation of agonistic interactions observed among the bachelors, a linear dominance hierarchy was discerned among the 4 adult stallions; all 4 colts were determined to be of equally low or seemingly non-ranking status. Social rank among the adults was most influenced by individual temperament, and contention for rank was limited almost exclusively to the 3 lower-ranking stallions; the alpha male participated in 73% of all agonistic interactions observed, but was identified as the recipient in less than 3% of these interactions. Intra-band associations were detected in the bachelor group. The most prevalent of these was among the 4 colts, found together in over 70% of the observations. Other affinities commonly observed were between the colts (as a sub-group) and different stallions. The dominant stallion, the colts' most frequent companion, actively discouraged the 3 lower-ranking stallions from associating with the colts. Further, the colts were subjected to significantly fewer agonistic behaviors than the non-alpha stallions (per colt=1.05+/-0.24 h-1; per non-alpha stallion=2.01+/-0.04 h-1). These findings support the hypothesis developed by other workers for ungulates that young bachelors are sheltered from aggression by association with an alpha male. With one exception, adult associations were rarely noted. Although combat-related injuries (superficial wounds and temporary lameness) were common among the bachelors, few required medical attention. No permanent disabilities or deaths have occurred since the group's inception. The existence of social organization and intra-band associations in the bachelor group support the suggestion that such groups were once a natural part of this species' social milieu. Bachelor groups are therefore recommended as an ethologically sound, space- and cost-effective means of managing “surplus” (i.e. non-harem) male Przewalski horses. |
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refbase @ user @ |
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781 |
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Author |
Galef Jr B.G., |
Title |
Approaches to the study of traditional behaviors of free-living animals |
Type |
Journal Article |
Year |
2004 |
Publication |
Learning & Behavior |
Abbreviated Journal |
Learn. Behav. |
Volume |
32 |
Issue |
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Pages |
53-61 |
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Abstract |
I review literature on four different approaches to the study of traditions in animals: observation of free-living animals, laboratory experiment, armchair analysis, and field experiment. Because, by definition, a tradition entails social learning of some kind, it is difficult, perhaps impossible, to establish that a behavior is in fact traditional without knowledge of how it develops. Observations of free-living animals often provide strong circumstantial evidence of a tradition. However, even in the view of several researchers who have studied possibly traditional behaviors in natural populations, observation alone has not proven sufficient to show that social learning contributes to development of behaviors of interest. The relevance of laboratory experiments to the understanding of the development of behaviors in free-living animals is always open to challenge. Armchair analyses of field data can produce interesting hypotheses but cannot test them. Field experiments to determine how behaviors of interest develop in population members provide a promising way forward. |
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refbase @ user @ |
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829 |
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Author |
Gajdon G.K.,; Fijn N.,; Huber L., |
Title |
Testing social learning in a wild mountain parrot, the kea (Nestor notabilis) |
Type |
Journal Article |
Year |
2004 |
Publication |
Learning & Behavior |
Abbreviated Journal |
Learn. Behav. |
Volume |
32 |
Issue |
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Pages |
62-71 |
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Huber, Taborsky, and Rechberger (2001) reported an experiment in which the efficiency with which captive keas opened a complex food container was increased by observation of a skilled conspecific. However, only testing social learning in free-ranging animals can demonstrate social learning in natural conditions. For that purpose, a tube-lifting paradigm was developed and tested on keas both in captivity and in Mount Cook National Park, New Zealand. The task was to remove a tube from an upright pole in order to gain access to a reward inside the tube. The top of the pole was higher than a standing kea, so that, to remove the tube, an individual had to simultaneously climb onto the pole and manipulate the tube up the pole with its bill. Because only 1 naive bird managed to remove a tube twice in 25 halfhour sessions and disappeared after success, another bird was trained to solve the task and to provide demonstrations for others. Even under such conditions, only 2 of at least 15 birds learned to remove the tube in 28 sessions. There was no indication that observer birds' use of bill and feet when exploring the tube changed as the number of observations of tube removal increased in a way that would, in principle, increase the likelihood of tube removal. The results suggest a dissociation of social learning potential as assessed in laboratory animals, and social transmission of foraging techniques in natural populations. |
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refbase @ user @ |
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830 |
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Author |
McLean, I.G.; Schmitt, N.T.; Jarman, P.J.; Duncan, C.; Wynne, C.D.L. |
Title |
Learning For Life: Training Marsupials To Recognise Introduced Predators |
Type |
Journal Article |
Year |
2000 |
Publication |
Behaviour |
Abbreviated Journal |
Behaviour |
Volume |
137 |
Issue |
10 |
Pages |
1361-1376 |
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Raising endangered species in captivity for reintroduction necessarily results in animals that lack appropriate skills for coping with problems to be faced in the wild, such as predators. Using classical conditioning techniques involving linking fear of a live dog with the image of a fox, we demonstrate an adjusted fear response for two wallaby species (rufous bettongs Aepyprymnus rufescens, quokkas Setonix brachyurus). No differences in response to the fox were found for wild-caught and captive-born bettongs, even though wild-caught subjects were likely to have encountered canids prior to capture. Attempts to condition a fear response by quokkas to an odour were unsuccessful. An attempt to induce fear of the stuffed fox by linking to fear of humans in quokkas was unsuccessful, but quokkas generalised from fear of the dog to fear of the fox, despite a delay of several weeks. Trained dogs offer a valuable and ethically acceptable mechanism for improving the ability of captive-reared (or sequestered) animals to recognise and cope with predators. |
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Equine Behaviour @ team @ |
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2282 |
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Author |
Bonabeau, E.; Theraulaz, G.; Deneubourg, J-L. |
Title |
Dominance orders in animal societies: the selforganization |
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Journal Article |
Year |
1999 |
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Bulletin of Mathematical Biology |
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Bull Math Biol |
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61 |
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4 |
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727-757 |
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In previous papers (Theraulaz et al. 1995, Bonabeau et al. 1996) we suggested, following Hogeweg and Hesper (1983, 1985), that the formation of dominance orders in animal societies could result from a selforganizing process involving a double reinforcement mechanism: winners reinforce their probability of winning and losers reinforce their probability of losing. This assumption, and subsequent models, were based on empirical data on primitively eusocial wasps (Polistes dominulus). By... |
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Equine Behaviour @ team @ |
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2172 |
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Author |
Galef, B. G. JR; White, D.J. |
Title |
Mate-choice copying in Japanese quail, Coturnix coturnix japonica |
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Journal Article |
Year |
1998 |
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Animal Behaviour. |
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Anim. Behav. |
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55 |
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3 |
Pages |
545-552 |
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1814 |
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Carson, K.; Wood-Gush, D.G.M. |
Title |
Equine behaviour: II. A review of the literature on feeding, eliminative and resting behaviour |
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Journal Article |
Year |
1983 |
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Applied Animal Ethology |
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Appl. Animal. Ethol. |
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10 |
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3 |
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179-190 |
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The literature on the feeding, eliminative and resting behaviour of horses has been reviewed to collate the information available on these subjects. The grazing and eliminative behaviour patterns of domestic horses are unlike those of free-ranging Equidae. The reasons for this are not known, but it can cause wasted grazing of up to 90% of a field. Certain conditions, such as provision of supplementary hay and lack of available herbage, can cause these behaviour patterns to change, although it is not known how to manipulate the grazing behaviour of horses to prevent deterioration of the pasture. Grazing behaviour is influenced by many variables and is more complex than the feeding behaviour of a stabled horse. Horses sleep for approximately 12% of the day and show 4 different sleep/wakefulness states -- alert wakefulness, drowsiness, slow-wave sleep and paradoxical sleep. Horses are able to maintain slow-wave sleep while standing, but they need to lie down for paradoxical sleep to occur, rarely spending more than 30 consecutive minutes in lateral recumbency. |
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refbase @ user @ |
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1990 |
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