Cross speciation? Maybe Prof. Dawkins does not believe in it. He is a bit of an expert in evolution. Have you read any of his books? It is fine to disagree with Dawkins, he has said that if you or anyone else can provide proof that any part of evolutionary theory is wrong he will accept it and change his mind. There is a moving account in one of his books about a scientist admitting 'he had been wrong these last thirty years' when shown proof. But a quote from the bible won't be quite enough.
Cross speciation. No idea what Prof Dawkins views on this are, but a few minutes on the web filled me in a bit. What is Theland's difficulty.
Stuff happens, over time, lots of time.