So species are created for certain environment and can't adapt to different, more milder one.
If that was so gradual, why were mammoths found frozen with still undigested vegetation in their stomachs?
Both geese and deer are FAR better quality than what you buy in the store.
It's a crazy politically correct set up. (as most regulations these days) High up in the North natives are told by the government to shoot as many as possible, because geese are destroying their own habitat. Way down South in the states (as shown on news clip) geese are trapped by netting and gased - then dumped. Yet in between non-native hunters are VERY strictly limited.