That is amazing, , you could call him Cupid!!! 
Funny enough his father was originally called cupid but we changed it to Rebus, and has a very similar mark on his back but not as perfect as this little boys, not sure what to call him yet but we will be ringing him and keeping him as a companion for Rebus as we do not feel he is good enough to register as a breeding Boer.
Last night we had another lovely little boy born and he has a heart on the back of his neck.
Ann