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«Pelagornis mauretanicus» de Didier Descouens - Trabajo propio. Disponible bajo la licencia CC BY-SA 3.0 vía Wikimedia Commons - |

Paraphysiornis, a phorusrachid (terror bird) from Oligocene South America. For much of the Cenozoic era, these giant flightless birds were the top predators.

de Bathornis grallator, CM 9377, de l'Éocène du Wyoming.

Evolutionary history of selected bird features inferred from multidisciplinary data.Recent studies demonstrate that major bird characteristics have evolved in a sequential way, and many of them initiated transformation early in dinosaur evolution, with some approaching modern conditions well before the origin of birds, whereas others appear only near the origin of the crown group birds. Source: Xu, X., Zhou, Z., Dudley, R., Mackem, S., Chuong, C., Erickson, G., & Varricchio, D. (2014). ...

The 28 Most Breathtaking Science Photos From 2014

The fossil of a primitive bird, Confuciusornis sanctus, that existed 125 to 120 million years ago. | The 28 Most Breathtaking Science Photos From 2014

A fossil Echinoid (type Heliophosa) from the Miocene period. The "fingers" were used for moving and feeding. From Safi, Morocco.