The 250-million year rise and fall of the dinosaurs | Steve Brusatte

Dinosaurs were resilient survivors that dominated the Earth for 150 million years, and while most perished in a massive extinction event 66 million years ago, their lineage lives on through birds, allowing mammals to eventually take control of the planet.

• Permian extinction survivors — after volcanic activity wiped out most life 250 million years ago, cat-sized reptiles emerged as the earliest ancestors of dinosaurs [02:14].
• Asteroid impact — a massive strike 66 million years ago triggered nuclear winter, collapsing food chains and killing most species on the planet [15:14].
• Tyrannosaur growth — these predators began as human-sized animals, only reaching massive proportions after other top predators died out during environmental shifts [20:40].
• T-Rex intelligence — the species possessed large brains with keen senses of smell and hearing, and its ancestors were covered in feathers [24:26].
• Arm function — rather than useless remnants, the short, muscular arms likely served vital roles during mating or close-quarters combat [28:10].
• Mammal coexistence — for 150 million years, mammals lived as small, nocturnal creatures, occupying the "underworld" while dinosaurs ruled the surface [39:27].
• Post-extinction brain growth — mammals rapidly grew in size after the asteroid impact to fill empty niches, which caused their relative brain-to-body size to temporarily decrease [46:30].
• Birds as dinosaurs — birds are directly descended from small, feathered dinosaurs and share key traits like hollow bones and efficient air-sac breathing [1:09:28].
• Modern bird survival — birds endured the extinction primarily by possessing beaks capable of eating seeds, which remained a stable food source when other plants collapsed [1:21:16].

How did flowering plants influence the diversification of mammal species? What physical evidence connects modern birds to their dinosaur ancestors?