Extinction Undone: Science Fiction

We hunted them to extinction decades ago, so there shouldn't be one staring in my window right now. Therefore, there isn't one staring in the window right now, and Amy is only screaming because Sean stole her toy. I look at the impossibility staring me in the eyes, and I know that all my denials will accomplish nothing. There is a wooly mammoth outside my window. Its breath fogs up the glass. Its tusks rattle along the siding of the house. A strange glow is in its eyes, a look that I don't recognize. It doesn't recognize me as the master of my home. It doesn't fear the human. A chill ripples over my skin, and I know why my ancestors hunted these beasts. The knowledge is intolerable.

Inspiration: My comment about hunting writers who write a perfect wordcount to extinction.
Story Potential: High. Really high.
Notes: Yeah. What would happen if all the extinct creatures--came back? (Because of alien intervention) If one succeeded in avoiding the preachy tone, it could be quite a good short story. Probably already written, of course.