After the mass extinction, creatures from all the clades slowly started to recover. The ones that bounced back the most were (obviously) hyracocarnivora, and surprisingly, volaticonectaphagia.
The supercontinent finally split up, and this is how the world looks now.
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Hyracia: the world of hyraxes
Ciencia Ficcióna little thought experiment in a world where the only major land vertebrates are hyraxes.