Palaeocelopterus in Podcasts

Their fossil record is incomplete, but it's believed that they descended from a group of birds capable of flight who survived the K-T extinction event and ultimately became flightless in order to fill a new niche, with the first potential pterobird, the Palaeocelopterus, popping up as far back as 53 million years ago during the early Eocene, when the Earth was still very hot and Brazil was enduring heavy rainfall.