Depends on what else is happening. You never know...genetic bottleneck = possible disease vulnerability, inbreeding etc. Much like the Cheetah, today.
Their population might not have been as healthy as it would otherwise seem. Funny that the respreading of the grasslands should've been great for the mammoths, since they're mostly grazers of grasses. Whereas, the mastodons were mostly browsers and would've been affected more so by the loss of the trees.
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