You could study…. Birds in Costa Rica Bats in Israel Squirrels in Canada Monkeys in Ethiopia Pronghorn in Montana www.animalbehavior.org. Sexual selection. Sex (the basics). Asexual and sexual organisms Sex and gender Sexual selection Selection affecting access to gametes.
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From Legrand and Morse 2000 Biol. J. Lin. Soc. 71:643-664
From Birkhead 1979 Anim. Behav. 27:866-874
From Amundsen & Forsgren 2001 PNAS 98:13155-13160
Photograph by Medford Taylor
Benefit of trait
Different genes promoting trait / preference