1. 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

2. Monogamy
Rare in mammals
Common in Birds

3. Polygyny – one male with many females
Common in mammals

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

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

6. 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)

7. Territorial Behavior

8. Calling

9. Fighting