This looks like the mother of all boars and likely crunched its way through a lot of opposition.
Our knowledge of mammalian evolution is speculative at best. Accepted ideas merely mean no proof at all except that the originators are all dead.
The mammalian and reptilian exegesis appear to be separate enough but are they really? The mammalian lineage is closer to our aquatic origins while the production of a shell is an unusual extra step by itself.
Certainly the reptilian population made thing difficult for other forms of life. Just how would we do today with the landscape filled with oversized hungry chickens? This had a thick skin at least..
Ancient elephant-sized mammal ancestor gave dinosaurs a run for their money
While mammals dominate the planet nowadays, for millions of years we played second fiddle to reptiles – most notably the dinosaurs. While reptiles became the biggest land animals to ever walk the Earth, mammals were mostly rat-sized critters running around underfoot. But now palaeontologists have described a mammal ancestor from the Triassic Period that bucked the trend and grew to the size of an elephant, giving those early dinosaurs a run for their money.
The newly-described species, named Lisowicia bojani, belonged to a group of animals called dicynodonts. Living about 250 to 220 million years ago during the Triassic, this herbivorous group has been described as "mammal-like reptiles," and would one day give rise to modern-day mammals.
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