Link to more pnas text, as usual it doesn't match the times copy very closely.<p><a href="https://www.pnas.org/doi/10.1073/pnas.2319696121" rel="nofollow">https://www.pnas.org/doi/10.1073/pnas.2319696121</a>
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.
Did an asteroid wipe out the dinosaurs? I think it was blood borne viruses transmitted by biting insects across the large surface area of the dinosaurs bodies. They had no immune system, short opportunity to adapt, only the smaller types lived.
>“The signal from the fossil record is not ambiguous,” Dr. Berv said<p>The fossil record says the asteroid had a big impact on bird evolution. A fancy new computer model trained on DNA data says it didn't. The computer model's results are surprising and not supported by the fossil record.<p>I know where I'm placing my bets.