Sorry about your loss. I bumped into a couple down at Bodala who also lost an alpaca a couple of months ago to a snake bite.
I mainly have red bellies here at The Oaks. They are generally placid and don't strike unless you accidentally step on one. The real buggers are the Eastern Brown, real mean and aggresive. Definitely not one to meet in the paddock.

Good thing about the Red belly black is it eats the eastern brown snake.