Elephants eating habits

This can be found at www.phenomenica.com/2012/07/african-elephants-are-picky-eaters/ … which is interesting as the same may have applied to mammoths. Elephants don't eat just anything but selectively choose what species they consume and which woody parts they find palatable. Elephants prefer the bark, stem and roots of plants and shrubs, or trees, rather than the foliage or fruit. Where might that leave the eating habits of mammoths in a frozen world?