with a broad rib cage supported by robust and well-articulated dorsal vertebrae

leaving deep marks in the earth

Although they feed calmly

suggesting that it was an agile and fast terrestrial predator

Seymouria baylorensis inhabited semi-arid environments and probably spent most of its time on land

Brontornis burmeisteri gazella with a broad rib cageMorphological description and paleoecological considerations of Brontornis burmeisteri (Aves, Phorusrhacidae?) from the Miocene of Argentina Brontornis burmeisteri , one of the most impressive fossil birds in the South American record, is known from remains found in Middle Miocene sediments (approximately 17 to 15 million years ago) in the Santa Cruz Formation, located in Argentine Patagonia. Initially assigned to the family Phorusrhacidae, this taxon