Big Al. "THey ate the the wrong kind of heather."

No, that answer is just too easy.

I only just learnt this myself in t'other thread that hit a roadblock.

https://www.southampton.ac.uk/geography/research/projects/ice_age_ecosystems_and_the_story_of_the_megafauna.page


It looks a convincing argument, but is it the truth? Anyway a bit more on the mini mammoths of Wrengel Island

http://www.nytimes.com/1993/03/25/us/dwarf-mammoths-may-have-put-off-demise.html