Hypothesis: Mammal Competition
Extinction implies that the species that perish are poorly adapted
to a changing set of conditions.
Faced with an evolving group of competing organisms -- the mammals
-- perhaps dinosaurs were driven to extinction by competition.
Packs of small mammals would have competed with dinosaurs for food.
And carnivorous mammals would have preyed on dinosaur eggs.
Not only did mammals likely compete with dinosaurs for resources,
many species survived the end-Cretaceous extinction and subsequently came to dominate