I'm currently in the Antique era, as far as I know, no AI has advanced to Classical era. I have multiple hunters scouring the two fairly large taiga and tundra areas of the map but no mammoths are to be found! I have plenty of musk ox and caribou and even penguins, not to mention all the birds flying around there, plus an occasional moose every now and then, but the big guys seem to be missing! Did I lose my chance of taming them if I didn't do it during the Prehistoric era? Or am I just unlucky and should keep killing/subduing the other Arctic/Polar animals to give room for them to spawn?