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Author |
Slagsvold, T.; Viljugrein, H. |
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Title |
Mate choice copying versus preference for actively displaying males by female pied flycatchers |
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Journal Article |
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Year |
1999 |
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Animal Behaviour. |
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Anim. Behav. |
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57 |
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3 |
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679-686 |
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1810 |
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Author |
Giraldeau, L.A.; Beauchamp, G. |
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Title |
Food exploitation: searching for the optimal joining policy |
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Year |
1999 |
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Trends In Ecology And Evolution |
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14 |
Issue |
3 |
Pages |
102-106 |
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Commonly invoked foraging advantages of group membership include increased mean food intake rates and/or reduced variance in foraging success. These foraging advantages rely on the occurrence of 'joining': feeding from food discovered or captured by others. Joining occurs in most social species but the assumptions underlying its analysis have been clarified only recently, giving rise to two classes of model: information-sharing and producer-scrounger models. Recent experimental evidence suggests that joining in ground-feeding birds might be best analysed as a producer-scrounger game, with some intriguing consequences for the spatial distribution of foragers and patch exploitation. |
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Dept of Biology, Concordia University, 1455 Ouest Blvd de Maisonneuve, Montreal, Quebec, Canada H3G 1M8 |
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English |
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0169-5347 |
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PMID:10322509 |
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2137 |
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Daly, M.; Wilson, M.I. |
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Title |
Human evolutionary psychology and animal behaviour |
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Journal Article |
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Year |
1999 |
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Animal Behaviour. |
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Anim. Behav. |
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57 |
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3 |
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509-519 |
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Homo sapiensis increasingly being studied within the evolutionary (adaptationist, selectionist) framework favoured by animal behaviour researchers. There are various labels for such work, including evolutionary psychology, human behavioural ecology and human sociobiology. Collectively, we call these areas `human evolutionary psychology' (HEP) because their shared objective is an evolutionary understanding of human information processing and decision making. Sexual selection and sex differences have been especially prominent in recent HEP research, but many other topics have been addressed, including parent-offspring relations, reciprocity and exploitation, foraging strategies and spatial cognition. Many HEP researchers began their scientific careers in animal behaviour, and in many ways, HEP research is scarcely distinguishable from other animal behaviour research. Currently controversial issues in HEP, such as the explanation(s) for observed levels of heritable diversity, the kinds of data needed to test adaptationist hypotheses, and the characterization of a species-typical `environment of evolutionary adaptedness', are issues in animal behaviour as well. What gives HEP a distinct methodological flavour is that the research animal can talk, an ability that has both advantages and pitfalls for researchers. The proper use of self-reports and other verbal data in HEP might usefully become a subject of future research in its own right. |
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Equine Behaviour @ team @ |
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2909 |
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Author |
Potì, P.; Langer, J.; Savage-Rumbaugh, S.; Brakke, K.E. |
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Title |
Spontaneous logicomathematical constructions by chimpanzees (Pan troglodytes, P. paniscus) |
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Journal Article |
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Year |
1999 |
Publication |
Animal Cognition |
Abbreviated Journal |
Anim. Cogn. |
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2 |
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3 |
Pages |
147-156 |
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Two experiments investigated the spontaneous construction of precursory logicomathematical operations by human-enculturated and language-reared chimpanzees (Pan troglodytes, Pan paniscus) when they were interacting freely with objects. In experiment 1, three chimpanzees ranging in age from 6 to 18 years were presented with sets of six objects. Chimpanzees constructed equivalence, order and reversibility relations within single sets of objects as well as between two or three contemporaneous sets of objects. The chimpanzees' logicomathematical operations were more advanced, including infrequent and minimal operations on three sets, than those of some previously investigated younger nonenculturated common chimpanzees. In experiment 2, six chimpanzees ranging in age from 6 to 21 years were presented with sets of 12 objects. Chimpanzees constructed more advanced operations on single sets, but not on contemporaneous sets. The results suggest partial convergence and partial divergence between development of logicomathematical cognition in chimpanzees and humans. |
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Equine Behaviour @ team @ |
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3125 |
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Author |
Heiling, A.M.; Herberstein, M.E. |
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The role of experience in web-building spiders (Araneidae) |
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Journal Article |
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1999 |
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Animal Cognition |
Abbreviated Journal |
Anim. Cogn. |
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2 |
Issue |
3 |
Pages |
171-177 |
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A typical feature of vertical orb-webs is the 'top/bottom' asymmetry, where the lower web region is larger than the upper web region. This asymmetry may improve prey capture success, because, sitting in the hub of the web, a spider can reach prey entangled below the hub faster than prey entangled in the area above the hub. While web asymmetry is known to vary intraspecifically, we tested if this variation also exists at the individual level and whether it is the result of experience, using two orb-web spider species, Argiope keyserlingi and Larinioides sclopetarius. The results reveal that experienced web-building spiders constructed more asymmetric webs than conspecifics deprived of any prior building experience over a period of several months. Experienced individuals invested more silk material into the web region below the hub, which covered a larger area. Moreover, web asymmetry was also influenced by previous prey capture experiences, as spiders increased the lower region of the web if it intercepted the most prey over a period of 6 days. Consequently, spiders may be able to use long-term web-building experience as well as short-term prey capture experience to build better traps. In contrast to previous views of spiders, experience can contribute to intraspecific as well as to individual variations in web design. |
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Equine Behaviour @ team @ |
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3154 |
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Author |
Santos, L.R.; Hauser, M.D. |
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Title |
How monkeys see the eyes: cotton-top tamarins' reaction to changes in visual attention and action |
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Journal Article |
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Year |
1999 |
Publication |
Animal Cognition |
Abbreviated Journal |
Anim. Cogn. |
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2 |
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3 |
Pages |
131-139 |
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Among social species, the capacity to detect where another individual is looking is adaptive because gaze direction often predicts what an individual is attending to, and thus what its future actions are likely to be. We used an expectancy violation procedure to determine whether cotton-top tamarins (Saguinus oedipus oedipus) use the direction of another individual's gaze to predict future actions. Subjects were familiarized with a sequence in which a human actor turned her attention toward one of two objects sitting on a table and then reached for that object. Following familiarization, subjects saw two test events. In one test event, the actor gazed at the new object and then reached for that object. From a human perspective, this event is considered consistent with the causal relationship between visual attention and subsequent action, that is, grabbing the object attended to. In the second test event, the actor gazed at the old object, but reached for the new object. This event is considered a violation of expectation. When the actor oriented with both her head-and-eyes, subjects looked significantly longer at the second test event in which the actor reached for the object to which she had not previously oriented. However, there was no difference in looking time between test events when the actor used only her eyes to orient. These findings suggest that tamarins are able to use some combination of head orientation and gaze direction, but not gaze direction alone, to predict the actions of a human agent. |
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Equine Behaviour @ team @ |
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3221 |
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Author |
Á. Miklósi |
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The Evolution of Cognition |
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1999 |
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Animal Cognition |
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Anim. Cogn. |
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2 |
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3 |
Pages |
179-180 |
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Heyes, C.; Huber, L. |
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Equine Behaviour @ team @ |
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3247 |
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Parr, L.A.; Winslow, J.T.; Hopkins, W.D. |
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Is the inversion effect in rhesus monkeys face-specific? |
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Journal Article |
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1999 |
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Animal Cognition |
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Anim. Cogn. |
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2 |
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3 |
Pages |
123-129 |
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This study investigated the face inversion effect in rhesus monkeys (Macaca mulatta). Face stimuli consisted of ten black-and-white examples of unfamiliar rhesus monkey faces, brown capuchin faces, and human faces. Two non-face categories included ten examples of automobiles and abstract shapes. All stimuli were presented in a sequential matching-to-sample format using an automated joystick-testing paradigm. Subjects performed significantly better on upright than on inverted presentations of automobiles, rhesus monkey and capuchin faces, but not human faces or abstract shapes. These results are inconsistent with data from humans and chimpanzees that show the inversion effect only for categories of stimuli for which subjects have developed expertise. The inversion effect in rhesus monkeys does not appear to be face-specific, and should therefore not be used as a marker of specialized face processing in this species. |
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Equine Behaviour @ team @ |
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3282 |
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Westergaard, G.C. |
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Structural analysis of tool-use by tufted capuchins (Cebus apella) and chimpanzees (Pan troglodytes) |
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1999 |
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Animal Cognition |
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Anim. Cogn. |
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2 |
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3 |
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141-145 |
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Using Matsuzawa's hierarchical system of classification, I compared tool-use patterns of tufted capuchins (Cebus apella) to those of chimpanzees (Pan troglodytes). The results indicated that wild C. apella exhibit fewer and less complex tool-use patterns than do captive C. apella and wild and captive P. troglodytes. Although most patterns of tool-use observed among P. troglodytes occur in captive C. apella, there are some notable exceptions, including tool-use in communicative contexts and the use ¶of three-tool combinations. I conclude that C. apella are unique among monkeys in their demonstrated propensities for higher-order combinatorial behavior and are likely capable of using symbolic combinations, although not at the level of complexity that has been demonstrated in ¶P. troglodytes. |
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Equine Behaviour @ team @ |
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3324 |
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Spinozzi, G.; Natale, F.; Langer, J.; Brakke, K.E. |
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Spontaneous class grouping behavior by bonobos (Pan paniscus) and common chimpanzees (P. troglodytes) |
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1999 |
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Animal Cognition |
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Anim. Cogn. |
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2 |
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3 |
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157-170 |
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Two experiments investigated spontaneous class grouping behavior by human-enculturated and language-reared bonobos (Pan paniscus) and common chimpanzees (P. troglodytes). In experiment 1, three chimpanzees ranging in age from 6 to 18 years were presented with six objects. The objects embodied three conditions: additive, multiplicative and disjoint classes. All chimpanzees spontaneously produced single- and two-category classifying. In experiment 2, six chimpanzees ranging in age from 6 to 21 years were presented with 12 objects in the same class conditions. Chimpanzees mainly produced single-category classifying. Their two-category classifying was more rudimentary than that found in experiment 1. Chimpanzees did not produce any three-category classifying which would be necessary to construct the hierarchies that humans begin to construct during early childhood. |
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Equine Behaviour @ team @ |
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3356 |
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