Sparassodonta
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Sparassodonta is an extinct order of carnivorous metatherian mammals related to modern marsupials. They were once considered to be true marsupials, but are now thought to be a separate side branch tha
Lycopsis longirostris AMNH
The skeleton of Lycopsis longirostrus, from the late middle Miocene of Colombia
Thylacosmilus had long sabers.
Skull of Borhyaena (Borhyaenidae)
Phorusrhacidae
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Phorusrhacidae, colloquially known as terror birds, is a family of large carnivorous, mostly flightless birds that includes possibly several subfamilies containing many genera, including the eponymous
Sparassodonta
…long period of "splendid isolation" during the Cenozoic; during this time, they shared the niches for large warm-blooded predators with the flightless terror birds. Previously, it was thought that these mammals died out in the face of competition from "more competitive" placental carnivorans during the Pliocene…
Skeleton of Titanis at the Florida Museum of Natural History
Phorusrhacinae skulls compared
The red-legged seriema, the closest living relative of phorusrhacids
Reconstructed skeleton of Paraphysornis at the Museu Nacional, Rio de Janeiro