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Author (down) Title Year Publication Serial Volume Pages
Powell, D.M. Preliminary evaluation of porcine zona pellucida (PZP) immunocontraception for behavioral effects in feral horses (Equus caballus) 1999 Journal of Applied Animal Welfare Science : JAAWS 1883 2 321-335
Powell, D. Female–female competition or male mate choice? Patterns of courtship and breeding behavior among feral horses (Equus caballus) on Assateague Island 2008 Journal of Ethology 5412 26 137-144-144
Hoff, M.P.; Powell, D.M.; Lukas, K.E.; Maple, T.L. Individual and social behavior of lowland gorillas in outdoor exhibits compared with indoor holding areas 1997 Applied Animal Behaviour Science 2143 54 359-370