Robbie

define "natural"

Firstly I definitely dont think that counts as a chimera, a chimera is something different (where the fertilised eggs of 2 different species are stuck together to create a type of mosaic organism half one animal half the other, ever heard of a liger?!), what you are talking about is a hybrid. I think it is actually possible as I have heard of goats /sheep being bred to produce certain antibodies and other junk in their milk. Why a rabbit though!?