The grass snakes comes in different colorations - black, olive or brownish, even in the same locality. The vipers tend to be brownish or black/silver grey or all black. I guess the vipers are a bit harder to see under grass but when they sun themselfs they usually are somewhat exposed so they are not all too difficult to spot.Sheri said:Those aren't too bad, not what I was expecting. Their coloration contrasts nicely really. I suspect it's not the same with the vipers though, they blend in more?