This video from Britain says about itself:
18 April 2016
Dinosaurs were already in an evolutionary decline tens of millions of years before the asteroid impact that finally wiped them out, scientists from the University of Reading and University of Bristol have found. Read more here.
Dr Manabu Sakamoto and Dr Chris Venditti, University of Reading, explain more.
This research was published on 18 April 2016 in the journal PNAS.
Filming took place in the Cole Museum of Zoology, University of Reading.
Asteroid animation courtesy of NASA.
See also here.