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Author |
Bugnyar, T.; Kotrschal, K. |
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Title |
Leading a conspecific away from food in ravens ( Corvus corax)? |
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Journal Article |
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Year |
2004 |
Publication |
Animal Cognition |
Abbreviated Journal |
Anim. Cogn. |
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7 |
Issue |
2 |
Pages |
69-76 |
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Misleading – Deception – Raven – Social foraging |
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Abstract |
Active misleading of conspecifics has been described as a social strategy mainly for primates. Here we report a raven leading a competitor away from food in a social foraging task. Four individuals had to search and compete for hidden food at color-marked clusters of artificial food caches. At the beginning of the experiment, a subordinate male found and exploited the majority of the food. As a result, the dominant male displaced him from the already opened boxes. The subordinate male then developed a pattern, when the loss of reward to the dominant got high, of moving to unrewarded clusters and opening boxes there. This diversion often led the dominant to approach those unrewarded clusters and the subordinate then had a head start for exploiting the rewarded boxes. Subsequently, however, the dominant male learned not to follow the subordinate to unrewarded clusters and eventually started searching for the reward himself. These interactions between the two males illustrate the ravens' potential for deceptively manipulating conspecifics. We discuss under which circumstances ravens might use this capacity. |
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2080 |
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Author |
Emery, N.J.; Dally, J.M.; Clayton, N.S. |
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Title |
Western scrub-jays ( Aphelocoma californica) use cognitive strategies to protect their caches from thieving conspecifics |
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Journal Article |
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Year |
2004 |
Publication |
Animal Cognition |
Abbreviated Journal |
Anim. Cogn. |
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Volume |
7 |
Issue |
1 |
Pages |
37-43 |
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Keywords |
Animals; Birds/*physiology; Feeding Behavior/*physiology; Female; *Food; Male; *Memory |
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Abstract |
Food caching birds hide food and recover the caches when supplies are less abundant. There is, however, a risk to this strategy because the caches are susceptible to pilfering by others. Corvids use a number of different strategies to reduce possible cache theft. Scrub-jays with previous experience of pilfering other's caches cached worms in two visuospatially distinct caching trays either in private or in the presence of a conspecific. When these storers had cached in private, they subsequently observed both trays out of reach of a conspecific. When these storers had cached in the presence of a conspecific, they subsequently watched the observer pilfering from one of the trays while the other tray was placed in full view, but out of reach. The storers were then allowed to recover the remaining caches 3 h later. Jays cached more worms when they were observed during caching. At the time of recovery, they re-cached more than if they had cached in private, selectively re-caching outside of the trays in sites unbeknown to potential thieves. In addition, after a single pilfering trial, the jays switched their recovery strategy from predominantly checking their caches (i.e. returning to a cache site to see whether the food remained there) to predominantly eating them. Re-caching remained constant across the three trials. These results suggest that scrub-jays use flexible, cognitive caching and recovery strategies to aid in reducing potential future pilfering of caches by conspecifics. |
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Sub-department of Animal Behaviour, University of Cambridge, High Street, CB3 8AA Madingley, Cambs, UK. nje23@cam.ac.uk |
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1435-9448 |
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PMID:12827547 |
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no |
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Call Number |
Equine Behaviour @ team @ |
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2566 |
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Fragaszy, D.; Visalberghi, E. |
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Title |
Socially biased learning in monkeys |
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Journal Article |
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Year |
2004 |
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Learning & behavior : a Psychonomic Society publication |
Abbreviated Journal |
Learn Behav |
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32 |
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1 |
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24-35 |
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Adaptation, Psychological; Animal Communication; Animals; Behavior, Animal; *Feeding Behavior/psychology; Food Preferences/psychology; Haplorhini/*psychology; *Imitative Behavior; Imprinting (Psychology); *Learning; *Social Environment; *Social Facilitation |
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We review socially biased learning about food and problem solving in monkeys, relying especially on studies with tufted capuchin monkeys (Cebus apella) and callitrichid monkeys. Capuchin monkeys most effectively learn to solve a new problem when they can act jointly with an experienced partner in a socially tolerant setting and when the problem can be solved by direct action on an object or substrate, but they do not learn by imitation. Capuchin monkeys are motivated to eat foods, whether familiar or novel, when they are with others that are eating, regardless of what the others are eating. Thus, social bias in learning about foods is indirect and mediated by facilitation of feeding. In most respects, social biases in learning are similar in capuchins and callitrichids, except that callitrichids provide more specific behavioral cues to others about the availability and palatability of foods. Callitrichids generally are more tolerant toward group members and coordinate their activity in space and time more closely than capuchins do. These characteristics support stronger social biases in learning in callitrichids than in capuchins in some situations. On the other hand, callitrichids' more limited range of manipulative behaviors, greater neophobia, and greater sensitivity to the risk of predation restricts what these monkeys learn in comparison with capuchins. We suggest that socially biased learning is always the collective outcome of interacting physical, social, and individual factors, and that differences across populations and species in social bias in learning reflect variations in all these dimensions. Progress in understanding socially biased learning in nonhuman species will be aided by the development of appropriately detailed models of the richly interconnected processes affecting learning. |
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Psychology Department, University of Georgia, Athens, Georgia 30602, USA. doree@uga.edu |
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1543-4494 |
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PMID:15161138 |
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refbase @ user @ |
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828 |
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Author |
Broucek, J., Uhrincat, M., Kišac, P., Hanus, A.. |
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Title |
Hair Whorl Position as a Predictor of Learning Ability and Locomotor Behavior in Cattle? |
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Journal Article |
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2004 |
Publication |
ACTA VETERINARIA BRUNENSIS |
Abbreviated Journal |
ACTA VET. BRNO |
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73 |
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4 |
Pages |
455-459 |
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Keywords |
Cattle, hair whorl, reversal learning, open-field |
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Abstract |
The aim of our work was to investigate the hypothesis that the speed of solving the maze tests and
locomotor behavior of heifers in open-field tests are affected by the height location of facial whorl.
Fifty-eight Holstein heifers were used. Maze learning was observed at the age of 15 weeks, and an
open-field test was applied at two ages, 16 weeks and 18 months. Whorl placement was recorded by
one person as each heifer entered the scale. The hair whorl position was determined on the basis of
two patterns: A) hair whorl high, middle and low and B) hair whorl high and low. Heifers with a
high hair whorl were the fastest (77.8 ± 84.3 s) and heifers with a middle hair whorl the slowest (87.3
± 100.3 s) in the A pattern during the maze tests. In the B whorl pattern, heifers with a high hair whorl
ran across the maze in 84.5 ± 95.2 s and heifers with a low hair whorl in 84.1 ± 97.9 s. The number
of crossed squares in a 5-minute open-field test in the A pattern was the non-significantly highest in
heifers with a high hair whorl (43.4) at the age of 16 weeks. In the B whorl pattern, heifers with a
high hair whorl were also more mobile, but neither differences in individual minutes nor in the whole
5 minutes were significant. Heifers with a high hair whorl displayed the strongest locomotory
behavior (37.6 squares) and heifers with a low hair whorl (30.8) were the slowest in the A pattern at
the age of 18 months. The differences were not significant. In the B whorl pattern, heifers with a
high hair whorl crossed more squares, but the difference was not significant in comparison with
heifers with a low hair whorl. We found that the time of traversing the maze and the locomotor
activity in open-field test may not be influenced in the dairy cattle by the height facial whorl position |
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Equine Behaviour @ team @ |
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4321 |
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Author |
Eckardt, G.; Windhofer, A. |
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Untersuchung der Beanspruchung von Pferden während Isolation und beim Verladen |
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2004 |
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Master's thesis |
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Equine Behaviour @ team @ |
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5190 |
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Author |
Hois, C. |
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Title |
Feldstudie zur Gewichtsentwicklung und Gewichtsschätzung beim wachsenden Pferd |
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2004 |
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Ph.D. thesis |
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Tierärztlichen Fakultät der Ludwig-Maximilians-Universität München |
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Equine Behaviour @ team @ |
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5204 |
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Author |
Monfort, S. |
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Title |
Przewalski’s Horse (Equus przewalskii) Species Survival Plan |
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Conference Article |
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2004 |
Publication |
PROCEEDINGS OF THE EAZA EQUID TAG MEETING FROM 5TH TO 9TH MAY 2004 AT HORTOBÁGY NATIONAL PARK, HUNGARY |
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A Master Planning meeting for the Asian wild horse, or Przewalski’s horse, was held 14th –15th April 2004 at the National Zoological Park’s Conservation and Research Center (CRC) in Front Royal, Virginia. The overall objectives of the meeting were to 1) develop a strategy to maximize genetic diversity and improve demographics, 2) make specific breeding recommendations, 3) establish ex situ research priorities, and 4) discuss strategies for ensuring that the North American herd contributes to the global managed population, as well as ongoing in situ conservation programs. Of particular importance were discussions focused on whether to continue managing the North American herd as two separate bloodlines — the A- and B-lines — or to manage the entire population using an M-line, or mixed-line strategy, designed to maximize founder representation and genetic diversity. The Equid Taxon Advisory Group has currently designated a target population of 150 specimens for this species. The current SSP population is 154 individuals distributed among 18 institutions (15 AZA, 3 non-AZA), of which San Diego Zoo, the Wilds, Minnesota Zoo, Calgary Zoo, the Wildlife Conservation Society/Bronx Zoo and the National Zoological Park were represented at the Master Planning meeting. |
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Smithonian’s National Zoo, Front Royal, USA |
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Equine Behaviour @ team @ |
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5301 |
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Author |
Zeitler-Feicht,; M. Walker, S.; Buxadé, C; Reiter, K. |
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Title |
Untersuchungen verschiedener Formen der Heuvorlage bei Pferden unter ethologischem Aspekt |
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2004 |
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Aktuelle Arbeiten zur artgemäßen Tierhaltung |
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209-216 |
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Equine Behaviour @ team @ |
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5658 |
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Zeitler-Feicht, M. H.; Walker, S.; Buxade, C.; Reiter, K. |
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Untersuchungen verschiedener Formen der Heuvorlage bei Pferden unter ethologischem Aspekt |
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2004 |
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KTBL Schriften |
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437 |
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Equine Behaviour @ team @ |
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5764 |
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Author |
Dukas, R. |
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Title |
Evolutionary Biology Of Animal Cognition |
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2004 |
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Annual Review of Ecology, Evolution, and Systematics |
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35 |
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1 |
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347-374 |
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This review focuses on five key evolutionary issues pertaining to animal cognition, defined as the neuronal processes concerned with the acquisition, retention, and use of information. Whereas the use of information, or decision making, has been relatively well examined by students of behavior, evolutionary aspects of other cognitive traits that affect behavior, including perception, learning, memory, and attention, are less well understood. First, there is ample evidence for genetically based individual variation in cognitive traits, although much of the information for some traits comes from humans. Second, several studies documented positive association between cognitive abilities and performance measures linked to fitness. Third, information on the evolution of cognitive traits is available primarily for color vision and decision making. Fourth, much of the data on plasticity of cognitive traits appears to reflect nonadaptive phenotypic plasticity, perhaps because few evolutionary analyses of cognitive plasticity have been carried out. Nonetheless, several studies suggest that cognitive traits show adaptive plasticity, and at least one study documented genetically based individual variation in plasticity. Fifth, whereas assertions that cognition has played a central role in animal evolution are not supported by currently available data, theoretical considerations indicate that cognition may either increase or decrease the rate of evolutionary change. |
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Equine Behaviour @ team @ |
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2970 |
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