I still don't buy it. I have a pretty good plausibility detector. You're asking me to believe that someone who speaks publicly and on TV about evolution all the time was stumped by a question that, like I said, a half-dozen people on these threads have answered over and over. And that this same experienced public speaker, rather than launching into an evasive answer right away, stared into space for 11 seconds before saying anything. That's...implausible.
But, of course, you will believe what you want.
Actually, now that I have demonstrated that partisans on both sides of the debate have acknowledged that Dawkins was stumped by the question, I think it would be more appropriate to say that YOU will ignore the obvious and believe what you want.