Haig, David2016-02-032013Haig, David. 2013. “Evolutionary Perspectives on Pregnancy.” Animal Behaviour 86 (3) (September): 660. doi:10.1016/j.anbehav.2013.06.007.0003-3472http://nrs.harvard.edu/urn-3:HUL.InstRepos:25070570en-USEvolutionary Perspectives on PregnancyJournal Article2015-10-09David Haig2016-02-0310.1016/j.anbehav.2013.06.007