Flying Steel wrote:That's no excuse
Um, yes it is. Getting extinct by outer means other than natural selection is anything but natural. Thus, it doesn't matter what kind of creature you are, no matter how 'superior' or inferior you are, you still will die.
If such a comet would strike us now and kill all humans and most of the life on this planet, then who's to say that bipedal tailed beings couldn't arise? Or are you saying that under no circumstances such creatures can exist whatsoever? If so, that's blind and inaccurate thinking.
Bipedal tailed dinosaurs are a great example that they can. If they were to get extinct by natural selection then I might have thought differently, but this isn't the case. In fact, they pretty much dominated over other species (don't take this for granted, I haven't read dinosaur history in a long time, but from what I can remember

). T-Rex and Velociraptors where the main superiors to others.