Problem
What species of Elephants could replace the extinct Columbia mammoth? Why scientist always claim that climate is main reason why megafauna are extinct even though most modern megafauna and animals survive the climate according to evidence that climate didn't really affect prehistoric megafauna during the last ice age and most megafauna of today have been around since plecioscence like brown bear and bison are still around today? Would the American lion and Columbian mammoth thrive in today ecosystem?