So looking at the timeline of DNA diversification in birds, the biggest spread occurred 10's millions of years before the asteroid mass extinction, and net ther

So looking at the timeline of DNA diversification in birds, the biggest spread occurred 10's millions of years before the asteroid mass extinction, and net there was not so much after the asteroid hit itself. Makes sense to me as I imagine birds were hit with devastated ecosystems and had to adapt, though I imagine their greater range made them more resilient.