This video from Canada is called Diving Birds in the Prairies: Late Cretaceous Hesperornithiformes.
From the BBC today:
The meteorite impact that coincided with the disappearance of the dinosaurs 65 million years ago, also saw a rapid decline in primitive bird species.
Only a few bird groups survived through the mass extinction, from which all modern birds are descended.
Researchers at Yale University have published their findings in PNAS this week.