Im sorry guys, I know you think this retro virus AKA AIDS, proves that rhinoceros and horses share a common ancestor, but I think its total horsesh!t.. Couldn't multiple species have contracted the same retro virus making it look as though it were inherited from some ancestor. Guys you don't have proof of transitional evolution because it is not a thing. maybe one type of finch adapted a beak to point up whereas there cousin's beak points down, but there is no way in hell that a tyrannosaurus evolved into a chicken, I am sorry.....