Mating systems Monogamy = pair bond between one male and one female Polygamy = one individual forms pair bonds with many others Polygyny = male mates with more than one female Polyandry = female mates with more than one male Promiscuity = mate with many, no pair bonds

Monogamy Rare in mammals Common in Birds

Polygyny – one male with many females Common in mammals

Polyandry – one female with many males rare Since females attract mate, they are larger And more colorful than male Wilson’s phalaropes

Promiscuity – no pair bonds Lek = common mating area Prairie Chicken Male sage grouse

Sexual Selection = choice of one sex by another Sexual Dimorphism = males and females look differently Color- males more brightly colored Ornamentation- antlers Size (if female larger = reverse sexual dimorphism) Hamilton-Zuk Hypothesis More brightly colored males have less parasites (healthier)

Territorial Behavior

Calling

Fighting