[Sacajaweau]

I look at those critters and think "God gone wild".

Reason for their extinction...while others "made it"??

[af_vet_rr]

Reason for their extinction...while others "made it"??

There's a lot of theories, but basically atmospheric and physical. Regardless of what camp you fall into as far as the extinction events, and your views on warm-blooded/cold-blooded dinosaurs, it's pretty clear dinosaurs probably weren't suited for colder weather (if I recall correctly, there were no polar ice caps during much of their reign as it were).

I've heard that due to the large size of many, that even slight changes in the atmosphere, especially Oxygen levels, would impact them a lot more than the smaller critters.

I don't think you can point at one event and say "that's it".

It's lucky for us, our ancestors probably had their hands full as it was, throwing dinos in the mix would have changed everything.