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Marean, C. W., & Gifford-Gonzalez, D. (1991). Late Quaternary extinct ungulates of East Africa and palaeoenvironmental implications. Nature, 350(6317), 418–420.
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Mills, G. (1991). Kalahari Hyenas.
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Houpt, K. A. (1991). Investigating equine ingestive, maternal, and sexual behavior in the field and in the laboratory. J. Anim Sci., 69(10), 4161–4166.
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Kendrick, K. M. (1991). How the sheep's brain controls the visual recognition of animals and humans. J. Anim Sci., 69(12), 5008–5016.
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Rilling, M. E., & Neiworth, J. J. (1991). How animals use images. Sci Prog, 75(298 Pt 3-4), 439–452.
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Schulte, N., & Klingel, H. (1991). Herd Structure, Leadership, Dominance and Site Attachment of the Camel, Camelus Dromedarius. Behaviour, 118(1-2), 103–114.
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Dugatkin, L. A., & Alfieri, M. (1991). Guppies and the TIT FOR TAT strategy: preference based on past interaction. Behav. Ecol. Sociobiol., 28(4), 243–246.
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Sakura O, & Matsuzawa T. (1991). Flexibility of wild chimpanzees nut-cracking behavior using stone hammers and anvils: an experimental analysis. Ethology, 87, 237.
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Beauchamp, G., & Kacelnik, A. (1991). Effects of the knowledge of partners on learning rates in zebra finches Taeniopygia guttata. Anim. Behav., 41(2), 247–253.
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Caanitz, H., O'Leary, L., Houpt, K., Petersson, K., & Hintz, H. (1991). Effect of exercise on equine behavior. Appl. Anim. Behav. Sci., 31(1-2), 1–12.
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