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Author |
Berger, J.; Cunningham, C. |
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Title |
Influence of Familiarity on Frequency of Inbreeding in Wild Horses |
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Year |
1987 |
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Evolution |
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Evolution |
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41 |
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229-231 |
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Equine Behaviour @ team @ |
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2232 |
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Author |
Glen-Leary J, |
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Title |
Stud book for zebras |
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Journal Article |
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Year |
1987 |
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Farmer's weekly |
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Notes |
from Professor Hans Klingels Equine Reference List |
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no |
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1115 |
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Author |
Tomasello, M.; Davis-Dasilva, M.; Camak, L.; Bard, K. |
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Title |
Observational learning of tool-use by young chimpanzees |
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Journal Article |
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Year |
1987 |
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Abbreviated Journal |
Human Evolution |
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Volume |
2 |
Issue |
2 |
Pages |
175-183 |
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Keywords |
Chimpanzees; Observational Learning; Tool-Use |
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Abstract |
In the current study two groups of young chimpanzees (4–6 and 8–9 years old) were given a T-bar and a food item that could only be reached by using the T-bar. Experimental subjects were given the opportunity to observe an adult using the stick as a tool to obtain the food; control subjects were exposed to the adult but were given no demonstration. Subjects in the older group did not learn to use the tool. Subjects in the younger group who were exposed to the demonstrator learned to use the stick as a tool much more readily than those who were not. None of the subjects demonstrated an ability to imitatively copy the demonstrator's precise behavioral strategies. More than simple stimulus enhancement was involved, however, since both groups manipulated the T-bar, but only experimental subjects used it in its function as a tool. Our findings complement naturalistic observations in suggesting that chimpanzee tool-use is in some sense «culturally transmitted» — though perhaps not in the same sense as social-conventional behaviors for which precise copying of conspecifics is crucial. |
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Kluwer Academic Publishers |
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0393-9375 |
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Equine Behaviour @ team @ |
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5915 |
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Author |
Klingel H, |
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Unpaarhufer, Pferde |
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1987 |
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Abbreviated Journal |
in Grzimek B (ed): Grzimeks Enzyklopädie Säugetiere |
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4 |
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548-592, Kindler |
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Notes |
from Professor Hans Klingels Equine Reference List |
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no |
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Call Number |
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1319 |
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DOBRORUKA LJ et al, |
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Title |
An analysis of the population of Grevy's zebra |
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Journal Article |
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Year |
1987 |
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Abbreviated Journal |
Int Zoo Yb |
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26 |
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290-293 |
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Notes |
from Professor Hans Klingels Equine Reference List |
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no |
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1018 |
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Author |
Deuel, N.R.; Lawrence, L.M. |
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Title |
Laterality in the gallop gait of horses |
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Journal Article |
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Year |
1987 |
Publication |
Journal of biomechanics |
Abbreviated Journal |
J Biomech |
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Volume |
20 |
Issue |
6 |
Pages |
645-649 |
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Keywords |
Animals; *Functional Laterality; *Gait; Horses/*physiology; Kinesis |
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Abstract |
Bilateral asymmetry in gallop stride limb contact patterns of four Quarter Horse fillies was documented by high-speed cinematography. Horses were filmed with rider by two cameras simultaneously while galloping along a straightaway. Even though signaled for each gallop lead an equivalent number of times, horses frequently switched leads, selecting the left lead nearly twice as often as the right. Velocities and stride lengths were greater for the left lead than the right, but stride frequencies did not differ between leads. Velocity effects were partitioned out in limb contact data analysis to enable the determination of persistent gallop stride asymmetries. The contact duration for the trailing (right) fore limb on the left lead exceeded the contact duration for the trailing (left) fore limb on the right lead. Selecting the right fore limb as the trailing fore limb may have allowed horses to use it to withstand the greater stresses and caused them to preferentially gallop with the left fore limb leading. Laterality may have an important influence on equine gallop motion patterns and thereby influence athletic performance. |
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0021-9290 |
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PMID:3611140 |
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Call Number |
refbase @ user @ |
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528 |
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Author |
Rumbaugh, D.M.; Savage-Rumbaugh, S.; Hegel, M.T. |
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Title |
Summation in the chimpanzee (Pan troglodytes) |
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Journal Article |
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Year |
1987 |
Publication |
Journal of Experimental Psychology. Animal Behavior Processes |
Abbreviated Journal |
J Exp Psychol Anim Behav Process |
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13 |
Issue |
2 |
Pages |
107-115 |
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Animals; Choice Behavior; *Cognition; Male; *Mathematics; *Pan troglodytes; Visual Perception |
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Abstract |
In this research, we asked whether 2 chimpanzee (Pan troglodytes) subjects could reliably sum across pairs of quantities to select the greater total. Subjects were allowed to choose between two trays of chocolates. Each tray contained two food wells. To select the tray containing the greater number of chocolates, it was necessary to sum the contents of the food wells on each tray. In experiments where food wells contained from zero to four chocolates, the chimpanzees chose the greater value of the summed wells on more than 90% of the trials. In the final experiment, the maximum number of chocolates assigned to a food well was increased to five. Choice of the tray containing the greater sum still remained above 90%. In all experiments, subjects reliably chose the greater sum, even though on many trials a food well on the “incorrect” tray held more chocolates than either single well on the “correct” tray. It was concluded that without any known ability to count, these chimpanzees used some process of summation to combine spatially separated quantities. Speculation regarding the basis for summation includes consideration of perceptual fusion of pairs of quantities and subitization. |
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0097-7403 |
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PMID:3572305 |
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Equine Behaviour @ team @ |
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2785 |
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Author |
Mcinnis Ml, V.M. |
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Title |
Dietary relationships among feral horses, cattle, and pronhorn in southeastern Oregon |
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Year |
1987 |
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Abbreviated Journal |
J Range Mgmt |
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40 |
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60-66 |
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from Professor Hans Klingels Equine Reference List |
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no |
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1379 |
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Author |
SUMMERS PM et al, |
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Title |
Sucessful transfer of the embryos of Przewalski's horses and Grant's zebra to domestic mares |
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1987 |
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J Reprod Fert |
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80 |
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13-20 |
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from Professor Hans Klingels Equine Reference List |
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1638 |
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Penzhorn Bl, L.P. |
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Title |
Comparisons of reproductive parameters of two Cape mountain zebra populations |
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1987 |
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J Reprod Fert Suppl |
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35 |
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661-663 |
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from Professor Hans Klingels Equine Reference List |
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Call Number |
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1462 |
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