Many species have been noted from historical observations and fossil digs to have disappeared from the planet. The Wiki page on African species alone shows the wide scope of that loss.
As the title states, I'm very interested to find out which species everyone else wishes to see return from the dead, if it were possible, through fertilisation techniques.
My top three picks are the woolly mammoth, Smilodon (sabre-tooth tiger) and the Caspian tiger. However, I am always intrigued by the varied morphology of known Felidae and Elephantidae members (these are the scientific families to which cats and elephants respectively belong to).
Some of the known variations (extinct) of the Elephantidae family are shown below. The different tusk configurations are pretty impressive.
Gomphotheres
Amebelodon
Deinotherium
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