The last Mammoths were probably a victim of climate change. They were found on an island that could have cut them off from the mainland with rising seas. Natural selection kept the smallest versions alive by not dying of starvation by depleting a limited food source.

Unrelated to the last island Mammoths, island bears became larger as they succeeded. Today the largest known bear is the Kodiak Island bear. This goes against the rules of Islands selecting smaller animals possibly because of an innate swimming ability by bears.

Or feasting on miniature mammoths?

naaa, they probably inbreed themselves to death like rich royalty



http://www.foxnews.com/science/2017/03/03/on-arctic-island-last-woolly-mammoths-had-genetic-meltdown.html

https://www.nytimes.com/2017/03/02/science/woolly-mammoth-extinct-genetics.html?mcubz=1