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Author |
Sommer, V.; Lowe, A.; Dietrich, T. |
![goto web page (via DOI) doi](img/doi.gif)
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Title |
Not eating like a pig: European wild boar wash their food |
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Journal Article |
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2016 |
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Animal Cognition |
Abbreviated Journal |
Anim. Cogn. |
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19 |
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1 |
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245-249 |
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Carrying food to water and either dunking or manipulating it before consumption has been observed in various taxa including birds, racoons and primates. Some animals seem to be simply moistening their food. However, true washing aims to remove unpleasant surface substrates such as grit and sand and requires a distinction between items that do and do not need cleaning as well as deliberate transportation of food to a water source. We provide the first evidence for food washing in suids, based on an incidental observation with follow-up experiments on European wild boar (Sus scrofa) kept at Basel Zoo, Switzerland. Here, all adult pigs and some juveniles of a newly formed group carried apple halves soiled with sand to the edge of a creek running through their enclosure where they put the fruits in the water and pushed them to and fro with their snouts before eating. Clean apple halves were never washed. This indicates that pigs can discriminate between soiled and unsoiled foods and that they are able to delay gratification for long enough to transport and wash the items. However, we were unable to ascertain to which degree individual and/or social learning brought this behaviour about. |
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1435-9456 |
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Equine Behaviour @ team @ Sommer2016 |
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6132 |
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Author |
Cinková, I.; Policht, R. |
![goto web page (via DOI) doi](img/doi.gif)
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Title |
Sex and species recognition by wild male southern white rhinoceros using contact pant calls |
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Journal Article |
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2016 |
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Animal Cognition |
Abbreviated Journal |
Anim. Cogn. |
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19 |
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2 |
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375-386 |
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Recognition of information from acoustic signals is crucial in many animals, and individuals are under selection pressure to discriminate between the signals of conspecifics and heterospecifics or males and females. Here, we first report that rhinos use information encoded in their calls to assess conspecifics and individuals of closely related species. The southern (Ceratotherium simum) and critically endangered northern (C. cottoni) white rhinos are the most social out of all the rhinoceros species and use a contact call pant. We found that southern white rhino pant calls provide reliable information about the caller’s sex, age class and social situation. Playback experiments on wild territorial southern white rhinoceros males revealed that they responded more strongly to the pant calls of conspecific females compared to the calls of other territorial males. This suggests that pant calls are more important form of communication between males and females than between territorial males. Territorial southern males also discriminated between female and territorial male calls of northern species and reacted more intensively to the calls of northern than southern males. This might be caused by a novelty effect since both species naturally live in allopatry. We conclude that white rhinos can directly benefit from assessing individuals at long distances using vocal cues especially because their eyesight is poor. Pant calls thus likely play a significant role in their social relationships and spatial organization. In addition, better understanding of vocal communication in white rhinos might be helpful in conservation management particularly because of their low reproduction in captivity. |
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Equine Behaviour @ team @ Cinková2016 |
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6144 |
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von Bayern, A.M.P. |
![goto web page (via DOI) doi](img/doi.gif)
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The role of experience in problem solving and innovative tool use in crows |
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2009 |
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Curr Biol |
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Equine Behaviour @ team @ von Bayern2009 |
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6290 |
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Passilongo, D.; Buccianti, A.; Dessi-Fulgheri, F.; Gazzola, A.; Zaccaronii, M.; Apollonio, M. |
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Title |
The Acoustic Structure Of Wolf Howls In Some Eastern Tuscany (Central Italy) Free Ranging Packs |
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Journal Article |
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2010 |
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Bioacoustics |
Abbreviated Journal |
Bioacoustics |
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Volume ![sorted by Volume (numeric) field, descending order (down)](img/sort_desc.gif) |
19 |
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3 |
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159-175 |
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Canis lupus, acoustic structure, mammal communication, sonogram, fundamental frequency. |
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Italian wolf howls are described for the first time from observations between 2003–2008 of a population living in eastern Tuscany, central Italy. A sample of 37 howls selected among single responses and 128 howls included in the choruses of 7 free ranging packs was recorded and analysed. The mean fundamental frequency of the howls ranged between 274–908 Hz. Two main structures recognised by means of multivariate explorative analysis, in particular Principal Component and Cluster Analysis, were ascribed to breaking and flat howls. Discriminant Function Analysis was applied to the recognised groups with the aim to find a general rule for classification. Howls with different features were correctly assigned to the groups obtained by explorative analysis in 95.8% of cases. The analysis of the variables characterising the structure of the howls suggests that maximum frequency and range of fundamental frequency are the most important parameters for classification, while duration does not appear to play any significant role. |
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Equine Behaviour @ team @ |
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6499 |
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Plumer, L.; Talvi, T.; Männil, P.; Saarma, U. |
![goto web page (via DOI) doi](img/doi.gif)
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Title |
Assessing the roles of wolves and dogs in livestock predation with suggestions for mitigating human-wildlife conflict and conservation of wolves |
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Journal Article |
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2018 |
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Conservation Genetics |
Abbreviated Journal |
Conservat. Genet. |
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Volume ![sorted by Volume (numeric) field, descending order (down)](img/sort_desc.gif) |
19 |
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3 |
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665-672 |
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Predation on livestock is a cause of serious and long-lasting conflict between farmers and wildlife, promoting negative public attitudes and endangering conservation of large carnivores. However, while large carnivores, especially the grey wolf (Canis lupus), are often blamed for killing sheep and other farm animals, free-ranging dogs may also act as predators. To develop appropriate measures for livestock protection, reliable methods for identifying predator species are critical. Identification of predators from visual examination of livestock wounds can be ambiguous and genetic analysis is strongly preferable for accurate species determination. To estimate the proportion of wolves and dogs implicated in sheep predation, we developed a sensitive genetic assay to distinguish between wolves and domestic dogs. A total of 183 predator saliva samples collected from killed sheep in Estonia were analysed. The assay identified the predator species in 143 cases (78%). Sheep were most often killed by wolves (81%); however, predation by dogs was substantial (15%). We compared the molecular results with field observations conducted by local environmental officials and recorded some disagreement, with the latter underestimating the role of dogs. As predator saliva samples collected from prey are often of poor quality, we suggest using mitochondrial DNA as a primary tool to maximise the number of successfully analysed samples. We also suggest adopting forensic DNA analysis more widely in livestock predation assessments as a legislative measure since misidentification that is biased against wolves can be counterproductive for conservation by enhancing conflict with society and leading to increased culling and poaching. |
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1572-9737 |
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Equine Behaviour @ team @ Plumer2018 |
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6509 |
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Kuczaj, S. A; Makecha, R.; Trone, M.; Paulos, R. D; Ramos, J. A. |
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Title |
Role of Peers in Cultural Innovation and Cultural Transmission: Evidence from the Play of Dolphin Calves |
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Journal Article |
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2006 |
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International Journal of Comparative Psychology |
Abbreviated Journal |
Int. J. Comp. Psychol |
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Volume ![sorted by Volume (numeric) field, descending order (down)](img/sort_desc.gif) |
19 |
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2 |
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223-240 |
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Equine Behaviour @ team @ |
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6526 |
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Drevemo, S.; Fredricson, I.; Hjertén, G.; McMIKEN, D. |
![goto web page (via DOI) doi](img/doi.gif)
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Title |
Early development of gait asymmetries in trotting Standardbred colts |
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1987 |
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Equine Veterinary Journal |
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Equine. Vet. J. |
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Volume ![sorted by Volume (numeric) field, descending order (down)](img/sort_desc.gif) |
19 |
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3 |
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189-191 |
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Summary Ten trotting Standardbred colts were recorded by high-speed cinematography at the ages of eight, 12 and 18 months. The horses were trotting on a treadmill operating at 4.0 m/secs. Five horses were subjected to a programme of intensified training from eight months of age, whereas the others were not trained and acted as controls. The films were analysed on a semi-automatic film-reading equipment and a number of variables used to demonstrate the gait symmetry were calculated and scaled by computer. Certain differences between left and right diagonal and contralateral pair of limbs, respectively, were noted, suggesting that laterality in horses may be inherited. The most pronounced systematic differences were found in 18-month old horses in the trained group. The results show the importance of careful gait examination and comprehensive coordination training at an early age. |
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American Medical Association (AMA) |
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0425-1644 |
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https://doi.org/10.1111/j.2042-3306.1987.tb01373.x |
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Equine Behaviour @ team @ |
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6702 |
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Rørvang, M.V.; Ahrendt, L.P.; Christensen, J.W. |
![goto web page (via DOI) doi](img/doi.gif)
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Title |
Horses fail to use social learning when solving spatial detour tasks |
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Journal Article |
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2015 |
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Animal Cognition |
Abbreviated Journal |
Anim.Cogn. |
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4 |
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847-854 |
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Social animals should have plenty of opportunities to learn from conspecifics, but most studies have failed to document social learning in horses. This study investigates whether young Icelandic horses can learn a spatial detour task through observation of a trained demonstrator horse of either the same age (Experiments 1 and 2, n = 22) or older (Experiment 3, n = 24). Observer horses were allowed to observe the demonstrator being led three times through the detour route immediately before being given the opportunity to solve the task themselves. Controls were allowed only to observe the demonstrator horse eating at the final position, but not the demonstration of the route. Although we found a tendency towards better performance by observer horses in the second experiment, we were unable to repeat this result in a similar set-up with a new group of horses and older, dominant demonstrator horses. We conclude that horses exposed to prior demonstration did not perform better than control horses in solving spatial detour tasks. |
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1435-9456 |
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Equine Behaviour @ team @ Rørvang2015 |
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6130 |
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Author |
Cinková, I.; Policht, R. |
![goto web page (via DOI) doi](img/doi.gif)
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Title |
Discrimination of familiarity and sex from chemical cues in the dung by wild southern white rhinoceros |
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2015 |
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Animal Cognition |
Abbreviated Journal |
Anim. Cogn. |
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Volume ![sorted by Volume (numeric) field, descending order (down)](img/sort_desc.gif) |
18 |
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1 |
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385-392 |
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Communication in rhinos is primarily mediated by the vocal and olfactory signals as they have relatively poor eyesight. White rhinos are the most social of all the rhinoceros species, they defecate at common dungheaps and the adult bulls use dung and urine to mark their territory. Chemical communication may therefore be particularly important in the social interactions of white rhinos, and its knowledge could be very helpful in their management and conservation. However, no studies have investigated up until now the olfactory discrimination in any rhinoceros species in the wild. We have experimentally studied the reactions of the wild southern white rhinos (Ceratotherium simum) to the dung of familiar and unfamiliar adult females and adult territorial males. We registered the number of sniffing events, the duration of sniffing and the latency of the vigilance posture from the onset of sniffing. The dung of unfamiliar rhinos was sniffed longer than that of familiar rhinos. The rhinos showed a shorter latency of vigilance posture to the familiar dung of males than that of females. For unfamiliar dung, they displayed a shorter latency of vigilance posture to female than male dung. Our results indicate that the rhinos are able to discriminate the familiarity and sex of conspecifics from the smell of their dung. Olfactory cues could therefore play an important role in the social relationships and spatial organization of the southern white rhinoceros. |
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Equine Behaviour @ team @ Cinková2015 |
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6143 |
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Author |
Whalen, A.; Cownden, D.; Laland, K. |
![goto web page (via DOI) doi](img/doi.gif)
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Title |
The learning of action sequences through social transmission |
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Journal Article |
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2015 |
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Animal Cognition |
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Anim. Cogn. |
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18 |
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5 |
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1093-1103 |
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Previous empirical work on animal social learning has found that many species lack the ability to learn entire action sequences solely through reliance on social information. Conversely, acquiring action sequences through asocial learning can be difficult due to the large number of potential sequences arising from even a small number of base actions. In spite of this, several studies report that some primates use action sequences in the wild. We investigate how social information can be integrated with asocial learning to facilitate the learning of action sequences. We formalize this problem by examining how learners using temporal difference learning, a widely applicable model of reinforcement learning, can combine social cues with their own experiences to acquire action sequences. The learning problem is modeled as a Markov decision process. The learning of nettle processing by mountain gorillas serves as a focal example. Through simulations, we find that the social facilitation of component actions can combine with individual learning to facilitate the acquisition of action sequences. Our analysis illustrates that how even simple forms of social learning, combined with asocial learning, generate substantially faster learning of action sequences compared to asocial processes alone, and that the benefits of social information increase with the length of the action sequence and the number of base actions. |
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Equine Behaviour @ team @ Whalen2015 |
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6192 |
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