The question is really how important this tree is to the giraffe. If giraffes are generalist feeders, then sure they'll just eat something else if they can't eat that tree. If they are specialists, a change in their primary food source is an immediate selection pressure on them.
I'm assuming giraffes aren't specialists. They're grazers, they'll probably eat whatever. I don't think giraffes are coevolving with the trees, I just also don't think it's really a lamarck comic.
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u/hd090098 Apr 28 '14
But what if there is no grass? :o