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If they don't show much difference, I have to wonder what, if anything, this says about the K-T event itself; whether it created a long-term climatological change in addition to a catastrophic change evidenced by the K-T geologic boundary. I'm also intrigued by the fact that these specimens were found in Colorado/New Mexico, which is pretty darn close to the best impact site candidate. I'd expect any animals that survived to be much further away.