All other dinos died 300,000 years before the supposed event
Birds, Sea Turtles, Alligators + Crocodiles, All Freshwater species, Honeybees and Photo-plankton lived through the supposed K-T event as if nothing happened (Even though they would be the organisms that should have been the 1st to go).
It's looking more & more that the K-T event was a non-event
Yes I know, An asteroid falling out of the sky and killing the big bad dinos sounds really, really cool, but sorry the evidence shows it just didn't happen.
Food chain disruption can selectively eliminate species. An asteroid has the capability of doing that.