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Author |
Clutton-Brock, T.H.; Parker, G.A. |
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Title |
Punishment in animal societies |
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Journal Article |
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1995 |
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Nature |
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373 |
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6511 |
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209-216 |
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Although positive reciprocity (reciprocal altruism) has been a focus of interest in evolutionary biology, negative reciprocity (retaliatory infliction of fitness reduction) has been largely ignored. In social animals, retaliatory aggression is common, individuals often punish other group members that infringe their interests, and punishment can cause subordinates to desist from behaviour likely to reduce the fitness of dominant animals. Punishing strategies are used to establish and maintain dominance relationships, to discourage parasites and cheats, to discipline offspring or prospective sexual partners and to maintain cooperative behaviour. |
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10.1038/373209a0 |
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Equine Behaviour @ team @ |
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4838 |
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Author |
Reeve, H.K. |
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Title |
Queen activation of lazy workers in colonies of the eusocial naked mole-rat |
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Journal Article |
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Year |
1992 |
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Nature |
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Nature |
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358 |
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147-149 |
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10.1038/358147a0 |
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Equine Behaviour @ team @ |
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4921 |
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Author |
Novacek, M.J. |
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Title |
Mammalian phylogeny: shaking the tree |
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Journal Article |
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Year |
1992 |
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Nature |
Abbreviated Journal |
Nature |
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Volume |
356 |
Issue |
6365 |
Pages |
121-125 |
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Keywords |
Animals; Evolution; Fossils; Mammals/classification/*genetics; *Phylogeny |
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Abstract |
Recent palaeontological discoveries and the correspondence between molecular and morphological results provide fresh insight on the deep structure of mammalian phylogeny. This new wave of research, however, has yet to resolve some important issues. |
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American Museum of Natural History, New York 10024 |
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0028-0836 |
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PMID:1545862 |
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Equine Behaviour @ team @ |
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3546 |
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Author |
Nowak, M.A.; Sigmund, K. |
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Title |
Tit for tat in heterogeneous populations |
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1992 |
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Nature |
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Nature |
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355 |
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250-253 |
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10.1038/355250a0 |
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Equine Behaviour @ team @ |
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4842 |
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Author |
Potts, W.K.; Manning, C.J.; Wakeland, E.K. |
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Title |
Mating patterns in seminatural populations of mice influenced by MHC genotype |
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Journal Article |
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Year |
1991 |
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Nature |
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Nature |
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352 |
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6336 |
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619-621 |
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10.1038/352619a0 |
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Equine Behaviour @ team @ |
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5424 |
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Author |
Marean, C.W.; Gifford-Gonzalez, D. |
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Title |
Late Quaternary extinct ungulates of East Africa and palaeoenvironmental implications |
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Journal Article |
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Year |
1991 |
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Nature |
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Nature |
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Volume |
350 |
Issue |
6317 |
Pages |
418-420 |
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Abstract |
UNGULATE communities of two East African savannas, the Serengeti and Athi-Kapiti Plains, are dominated by wildebeest (Connochaetes taurinus) supplemented by zebra (Equus burchelli), topi (Damaliscus lunatus), hartebeest (Alcelaphus buselaphus), buffalo (Syncerus caffer) eland (Taurotragus oryx) and gazelles (Gazella grand and G. thomsoni)1-3. Before this research, little was known of East African large mammal communities in the Late Pleistocene and early to middle Holocene. We document an extinct impala-sized alcelaphine antelope that is numerically dominant in Late Pleistocene archaeofaunal assemblages from the Athi-Kapiti Plains. The extinct giant buffalo Pelorovis antiquus is present, and a number of arid-adapted regionally extinct species are common. The small alcelaphine is rare in northern Tanzania, but regionally extinct arid-adapted species are present in Late Pleistocene deposits. These data indicate that as recently as 12,000 years ago, the large mammal community structure of East African savannas was very different and dry grasslands and arid-adapted ungulates expanded at least as far south as northern Tanzania during the Last Glacial Maximum. |
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10.1038/350418a0 |
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Call Number |
Equine Behaviour @ team @ |
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2345 |
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Author |
Terrace, H.S. |
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Title |
Chunking by a pigeon in a serial learning task |
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Journal Article |
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Year |
1987 |
Publication |
Nature |
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Nature |
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Volume |
325 |
Issue |
7000 |
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149-151 |
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Keywords |
Animals; Cognition/*physiology; Columbidae/*physiology; Feedback; Learning/*physiology; Male |
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Abstract |
A basic principle of human memory is that lists that can be organized into memorable 'chunks' are easier to remember. Memory span is limited to a roughly constant number of chunks and is to a large extent independent of the amount of informaton contained in each chunk. Depending on the ingenuity of the code used to integrate discrete items into chunks, one can substantially increase the number of items that can be recalled correctly. Newly developed paradigms for studying memory in non-verbal organisms allow comparison of the abilities of human and non-human subjects to memorize lists. Here I present two types of evidence that pigeons 'chunk' 5-element lists whose components (colours and achromatic geometric forms) are clustered into distinct groups. Those lists were learned twice as rapidly as a homogeneous list of colours or heterogeneous lists in which the elements are not clustered. The pigeons were also tested for knowledge of the order of two elements drawn from the 5-element lists. They responded in the correct order only to those subsets that contained a chunk boundary. Thus chunking can be studied profitably in animal subjects; the cognitive processes that allow an organism to form chunks do no presuppose linguistic competence. |
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0028-0836 |
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PMID:3808071 |
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Call Number |
Equine Behaviour @ team @ |
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2792 |
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Author |
Matsuzawa, T. |
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Title |
Use of numbers by a chimpanzee |
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Journal Article |
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Year |
1985 |
Publication |
Nature |
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Nature |
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Volume |
315 |
Issue |
6014 |
Pages |
57-59 |
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Keywords |
Animals; Behavior, Animal/physiology; Cognition; Female; Mathematics; Pan troglodytes/*physiology |
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Abstract |
Recent studies have examined linguistic abilities in apes. However, although human mathematical abilities seem to be derived from the same foundation as those in language, we have little evidence for mathematical abilities in apes (but for exceptions see refs 7-10). In the present study, a 5-yr-old female chimpanzee (Pan troglodytes), 'Ai', was trained to use Arabic numerals to name the number of items in a display. Ai mastered numerical naming from one to six and was able to name the number, colour and object of 300 types of samples. Although no particular sequence of describing samples was required, the chimpanzee favoured two sequences (colour/object/number and object/colour/number). The present study demonstrates that the chimpanzee was able to describe the three attributes of the sample items and spontaneously organized the 'word order'. |
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0028-0836 |
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PMID:3990808 |
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Equine Behaviour @ team @ |
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2793 |
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Author |
McGonigle, B. |
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Title |
Can apes learn to count? |
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1985 |
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Nature |
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Nature |
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315 |
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6014 |
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16-17 |
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Animals; Behavior, Animal/physiology; Cognition; Pan troglodytes/*physiology |
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0028-0836 |
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PMID:3990806 |
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Equine Behaviour @ team @ |
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2794 |
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Author |
Seyfarth, R.M.; Cheney, D.L. |
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Title |
Grooming, alliances and reciprocal altruism in vervet monkeys |
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Journal Article |
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Year |
1984 |
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Nature |
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Nature |
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Volume |
308 |
Issue |
5959 |
Pages |
541-543 |
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Keywords |
*Altruism; Animals; Cercopithecus/*physiology; Cercopithecus aethiops/*physiology; *Grooming; *Social Behavior; Vocalization, Animal |
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Abstract |
Reciprocal altruism refers to the exchange of beneficial acts between individuals, in which the benefits to the recipient exceed the cost to the altruist. Theory predicts that cooperation among unrelated animals can occur whenever individuals encounter each other regularly and are capable of adjusting their cooperative behaviour according to experience. Although the potential for reciprocal altruism exists in many animal societies, most interactions occur between closely related individuals, and examples of reciprocity among non-kin are rare. The field experiments on vervet monkeys which we present here demonstrate that grooming between unrelated individuals increases the probability that they will subsequently attend to each others' solicitations for aid. Vervets appear to be more willing to aid unrelated individuals if those individuals have behaved affinitively toward them in the recent past. In contrast, recent grooming between close genetic relatives appears to have no effect on their willingness to respond to each other's solicitations for aid. |
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0028-0836 |
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PMID:6709060 |
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refbase @ user @ |
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704 |
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