1. W.D. Hamilton ( )
Kin selection theory

2. Kin Selection & Hamilton’s Rule
Altruism is favored when:
rB - C > 0 or C/B > r
r = relatedness between altruist and recipient
B = fitness benefit to recipient
C = fitness cost to the altruist

3. Eusociality Species that live in colonies of overlapping generations
One or a few individuals produce all the offspring and the rest serve as functionally sterile helpers in rearing young and protecting the colony
Division of labor
Reproductive castes

5. The Naked Mole-Rat: A Eusocial Mammal

6. Division of labor and reproductive hierarchy

7. Coral Snake and Scarlet King Snake
Can you tell the difference???

8. Viceroy and Monarch Butterflies
Predators need only encounter one form to shun both.

9. The Cuckoo - A Brood Parasite

10. Garter Snakes