Cave drawings show that the Cave Lion ( Panthera spelaea) did not possess a mane. Existing models related this to social structure, suggesting that prey density at the mammoth steppe was too low for large prides, which in turn resulted in a smaller mane in the males as there was a lesser need for dominance display. Recently a more straightforward model was proposed, relating the absence of mane to thermoregulation. The Ice Age was too cold to walk around with a fur collar.