What feature of *Hyaenodon* was described as quite large relative to the rest of its body?

Answer

Its skull

The skull of *Hyaenodon* was a distinctive feature described as being quite large relative to the rest of the body, housing immense musculature to power the jaw.

What feature of *Hyaenodon* was described as quite large relative to the rest of its body?

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Hyaenodon: Most successful mammalian carnivore ever - YouTube

extinctmammalfossilCarnivoreHyaenodon