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Bridges, R. S., R. DiBiase, D. D. Loundes, and P. C. Doherty.  1985. Prolactin 
     stimulation of maternal behavior in female rats.  Science 227:  782-784.

Cook, R. S.  1993.  Ecological issues on reintroducing wolves into Yellowstone 
     National Park.  Scientific Monograph NPS/NRYELL/NRSM-93/22.  U.S. Department 
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Dixson, A. F., and L. George.  1982.  Prolactin and parental behaviour in a male 
     New World primate.  Nature 299:  551-553.

Fentress, J. C., and J. Ryon.  1982.  A long-term study of distributed pup feeding 
     in captive wolves.  Pages 238-260 in Wolves of the World.  Edited by F. H. 
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Gubernick, D. J., and R. J. Nelson.  1989.  Prolactin and paternal behavior in 
     the biparental California mouse, Peromyscus californicus.  Hormonal 
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Kreeger, T. J., U. S. Seal, Y. Cohen E. D. Plotka, and C. S. Asa.  1991. 
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     Journal of Zoology 69:  1366-1374

Mech, L. D.  1988.  The Arctic Wolf:  Living with the pack.  Voyageur Press.  
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Mech, L. D.  1993.  Resistance of young wolf pups to inclement weather. Journal of 
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Mech, L. D. 1995.  A ten-year history of the demography and productivity of an 
     arctic Wolf pack.  Arctic 48:  329-332.

Mech, L. D. in press.  Summer movements and behavior of a pup-free arctic wolf 
     pack.  Canadian Field Naturalist.

Mech, L. D., and U. S. Seal.  1987.  Premature reproductive activity in wild 
     wolves.  Journal of Mammalogy 68:  871-873.

Mech, L. D., and J. M. Packard.  1990.  Possible use of (Canis lupus) den over 
     several centuries.  Canadian Field Naturalist 104:  484-485.

Mech, L. D., T. J. Meier, and U. S. Seal.  1993.  Wolf nipple measurements as 
     indices of age and breeding season.  American  Midland Naturalist 129:  266-271. 

Numan, M.  1988.  Maternal behavior.  Pages 1569-1645 in The physiology of 
     reproduction.  Edited by E. Knobil, and J. Neill.  Raven Press,   Ltd., 
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Seal, U. S., E. D. Plotka, J. M. Packard, and L. D. Mech.  1979. Endocrine 
     correlates of reproduction in the wolf.  Biology of Reproduction 21:    
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Zarrow, M. X., R. Gandelman, and V. H. Denenberg.  1971.  Prolactin:  is it 
     essential hormone for maternal behavior in the mammal?  Hormonal Behaviour 
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