Bitis caudalis- Horned Puff Adder, one of my favourite vipers. Gonna add them to my collection one day I hope! Caudal luring sure is fascinating behaviour, love watching that.
Anyway I've said it many times, Al's videos on U-Tube are a god-send and I owe pretty much all of my venomous snake husbandry and safety techniques to that guy. Thankyou Al!!