Cave Lion

The cave lion (Panthera spelaea) is an extinct species of big cat that lived during the Pleistocene in Eurasia. It became extinct 13,000 years ago.

In Prehistoric Park
According to a storyboard, a cave lion would have made an appearance in A Mammoth Undertaking. Nigel Marven would've encountered one whilst riding through the forest on his snowmobile, it appeared briefly hiding behind a tree, and when Nigel turned to get a better look it had runoff.

Errors

 * The Cave lion actually went extinct 3,000 years before that part of the episode was set, 10,000 years ago. So it makes sense to remove it from the episode.