If humans find a technique to catch a mammoth (eg. lure it into a big hole), then they will eat mammoth meat... But next week, when the uneaten mammoth meat

If humans find a technique to catch a mammoth (eg. lure it into a big hole), then they will eat mammoth meat... But next week, when the uneaten mammoth meat has gone bad, they will catch another. After a few years, you have a massive mammoth graveyard and mammoths are extinct. Doesn't seem at all surprising.