| Natural hybridization between Dall's porpoises (Phocoenoides dalli) and harbour porpoises (Phocoena phocoena) PM Willis, BJ Crespi, LM Dill, RW Baird, MB Hanson Canadian journal of zoology 82 (5), 828-834, 2004 | 95 | 2004 |
| Encounter rates with conspecific males influence female mate choice in a naturally hybridizing fish PM Willis, MJ Ryan, GG Rosenthal Behavioral Ecology 22 (6), 1234-1240, 2011 | 83 | 2011 |
| Status of the dwarf sperm whale, Kogia simus, with special reference to Canada PM Willis, RW Baird Canadian Field-Naturalist 112 (1), 114-125, 1998 | 64 | 1998 |
| Mixed ancestry and admixture in Kauai's feral chickens: Invasion of domestic genes into ancient Red Junglefowl reservoirs E Gering, M Johnsson, P Willis, T Getty, D Wright Molecular Ecology 24 (9), 2112–2124, 2015 | 59 | 2015 |
| Feralisation targets different genomic loci to domestication in the chicken M Johnsson, E Gering, P Willis, S Lopez, L Van Dorp, G Hellenthal, ... Nature communications 7 (1), 12950, 2016 | 55 | 2016 |
| An intergeneric hybrid in the family Phocoenidae RW Baird, PM Willis, TJ Guenther, PJ Wilson, BN White Canadian Journal of Zoology 76 (1), 198-204, 1998 | 48 | 1998 |
| An Indirect Cue of Predation Risk Counteracts Female Preference for Conspecifics in a Naturally Hybridizing Fish Xiphophorus birchmanni PM Willis, GG Rosenthal, MJ Ryan PloS one 7 (4), e34802, 2012 | 41 | 2012 |
| Why do animals hybridize? PM Willis acta ethologica, 2013 | 38 | 2013 |
| Mate Guarding in Male Dall's Porpoises (Phocoenoides dalli) PM Willis, LM Dill Ethology 113 (6), 587-597, 2007 | 34 | 2007 |
| Ecology, song similarity and phylogeny predict natural hybridization in an avian family PM Willis, RE Symula, IJ Lovette Evolutionary Ecology 28 (2), 299-322, 2014 | 31 | 2014 |
| Strandings and fishing gear entanglements of cetaceans off the west coast of Canada in 1994 TJ Guenther, RW Baird, RL Bates, PM Willis, RL Hahn, SG Wischniowski International Whaling Commission Document SC/47 O 6, 1995 | 28* | 1995 |
| Sightings and strandings of beaked whales on the west coast of PM Willis, RW Baird Aquatic Mammals 24 (1), 21-25, 1998 | 13 | 1998 |
| Mating System Dynamics and Hybridization of Dall's (Phocoenoides Dalli) and Harbour Porpoise (Phocoena Phocoena) PM Willis | 3 | 2001 |
| Predation risk and encounter rates with conspecific males influence female mate choice in hybridizing swordtail fishes PM Willis, MJ Ryan, GG Rosenthal Integrative and Comparative Biology 50, E313-E313, 2010 | 2 | 2010 |
| Strandings and fishing gear entanglements of cetaceans off the west coast of Canada in 1995 PM Willis, TJ Guenther, RL Bates, RW Baird, ML McAdie International Whaling Commission Meeting Document SC/48 O 2, 1996 | 2 | 1996 |
| Post-Invasive Evolution of Hawaii's Feral Chickens E Gering, P Willis, T Getty, D Wright | | 2014 |
| Mate choice and hybridization within swordtail fishes (Xiphophorus spp.) and wood warblers (family Parulidae) PM Willis | | 2011 |
| NOTES/NOTES PM Willis, BJ Crespi, LM Dill, RW Baird, MB Hanson, AT Peterson, ... Canadian Journal of Zoology 82, 2004 | | 2004 |
