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Kusunose R, S. H. (1984). The behavioral development of thouroughbred foals and the relationship between dams and foals. Jap J Zootechn Sci, 55, 263–271.
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Lloyd P,. (1984). The Cape Mountain Zebra 1984. Afr Wildl, 38, 144–149.
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Mccort Wd,. (1984). Behavior of feral horses and ponies. J Anim Sci, 58, 493–499.
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Penzhorn Bl,. (1984). A long – term study of social organisation and bhabiour of Cape mountain zebras. Z. Tierpsychol., 64, 97–146.
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Penzhorn Bl,. (1984). Dental abnormalities in free – ranging Cape mountain zebras. J Wildl Dis, 20, 161–166.
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Penzhorn Bl,. (1984). Observations on mortality of free – ranging Cape mountain zebras. S Afr Wildl Res, 14, 89–90.
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Reichholf J,. (1984). Funktion und evolution des Streifenmusters bei den zebras. Säugetierk Mitt, 32, 89–95.
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SCHILDER MBH et al,. (1984). A quantitative analysis of facial expressions in the plains zebra. Z. Tierpsychol., 66, 11–32.
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Vogt H,. (1984). Quagga: DNA konserviert. Naturwiss Rdsch, 37, 327–328.
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Kacelnik, A., & Houston, A. I. (1984). Some effects of energy costs on foraging strategies. Anim. Behav., 32(2), 609–614.
Abstract: We consider the effect of including energy costs on the optimal strategy for animals exploiting a depleting food resource. In the context of central place foraging this leads to the problem of what load size should be brought back to the central place. Two strategies are discussed: (i) maximize gross rate of energy delivery and (ii) maximize net rate of energy delivery. The optimal load size (or optimal patch time) for net maximizers is not always larger than for gross maximizers, as has been claimed. Instead, the difference in optimal load size has the same sign as the difference between metabolic rates of travelling and foraging. We point out that the influence of costs has not always been correctly incorporated in experimental tests of the theory.
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