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Citations
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Keiper Rr,. (1976). Interactions between cattle egrets and feral ponies. Proc Pennsyl Acad, 50, 89–90.
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Keiper Rr, K. M. (1980). Nocturnal activity patterns of feral ponies. J Mammal, 61, 116–118.
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Keiper Rr,. (1977). Observations on the nocturnal behavior of feral ponies. Proc Pennsyl Acad Sci, 51, 57–58.
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Keiper Rr,. (1979). Population dynamics of feral ponies. Laramie: Symposium on the Ecology and Behavior of wild and feral Equids.
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Keiper Rr, B. J. (1982). Refuge – seeking and pest avoidance by feral horses in desert and island environments. App Anim Ethol, 9, 111–120.
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Keiper Rr,. (1986). The Przewalski horse ecosystem: programs and progress. In Majumdaret al : Endangered and threatened species programs in Pensylvania and other States.
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