The Cretaceous-Paleogene (K-Pg) extinction event marked a pivotal moment in avian evolution. Following this mass extinction, birds diversified rapidly and filled ecological niches left vacant by dinosaurs.
Rapid Adaptation
- Birds evolved smaller body sizes, which allowed them to survive on less food.
- Their feathers likely helped with insulation and display, aiding in survival and reproduction.
Key Diversification Periods
- Eocene Epoch (56-34 million years ago): Warm climate led to the emergence of many new bird species.
- Oligocene Epoch (34-23 million years ago): Birds began to develop specialized features, such as beak shapes for different diets.
Pro tip: Understanding this timeline helps explain why modern birds exhibit such a wide range of behaviors and habitats.