[quote=thewizardguy]
Yeah, you're right, ultraviolet is out. And yeah, I think they are warmblooded. However, it's also been established that vampires don't breahe. So maybe vampiric cells simply duplicate incredibly rapidly, and are able to transport oxygen directly. It would be interesting to see....
[/quote]

Maybe its black magic! 
hehe

I suggest we hope for Shikaru to drop an information bomb here.