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lagomorph evolution


Lagomorphs (pikas, hares and rabbits) evolved it is theorised, in the Eocene Epoch, which was 55-35 million years ago.

There is in the fossil record a uniqueness from the early Eocene, so for me this stands to set it at 55 mya.
 
left: Gomphos elkema, from the earliest Eocene of Mongolia.

Apparently there used to be far more species; in the past (as in millions of years ago) over 230 species existed. 

Other accounts put them at evolving 2 million years ago. (that's palaeontology for you)
Lagomorphs are not rodents.

There used to exist, in Minorca, a Lagomorph that weighed about 50 pounds, called Nuralagus rex



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