I would like to question the following quote to probe about its meaning. I ask that we keep this thread pure from any argueing as there are plenty of other threads ongoing where one can participate in that. UTEOTW , you wrote, I'm not sure why any such simularities in and of themselves are evidence of evolution. Indeed, one could just as well say that any simularities in genetics is proof that the "designer" was using the same building blocks. Lets start with Monkeys and Humans. I believe it has been said that 95% of of our genetics is indentical. But this in and of itself doesn't say we evolved from a common ancestor. It could just be as likely that God thought "Hmm, I plan on making humans and monkeys look pretty similar so I will use much of the same DNA!" To be honest, I would expect our DNA to be very similar, we look a lot alike! Our hearts and lungs and kidneys probably work in the exact same fashion so I would expect the DNA coding their constrution and DNA coding the proteins that facilitate their use would be indentical. But now lets go to your question. Why would we EXPECT a crocondille and a bird to be more similar (in genetic structure) then other animals. Well, we probably wouldn't expect it one way or another. I we may find this a very interesting surprise. But once again, it just would no more prove evolution then prove that God wished these two animals to share many characteristics (most of which we obviously couldn't recognize on the surface). Anyway, just a thought.