1. Paleoecology of the Dinosaurs The study of ancient interactions of organisms

2. Dinosaurs as Social Animals Traveled in herds Migrated long distances Made nests Cared for their young

3. Maiasaura Nest

4. Predator/Prey Relationships Meat-eating dinosaurs hunted in packs Plant-eating dinosaurs developed large size, horns, spikes, and hard armor to defend themselves

5. Robert Bakker

6. Bakker’s Theory on Predator/Prey Relationships and Internal Body Temperature Endotherms require more energy than ectotherms, which is directly reflected in biomass Uniform predator/prey biomass ratios Endotherms: 1% to 3% Ectotherms: 40% Dinosaurs: 2% to 4%

7. Criticism to Bakker’s Theory Assumed prey were same size as predators Spatial, social, health factors also constrain predator populations, not just prey Difficult to estimate true weight of dinosaurs Preservation of dinosaur faunas can be very misleading Because of these, his results can hardly be conclusive