a marvellous idea
yes, i see this too, but i know them to be grass snakes in the area where i live, as there are a few of them about and we don't seem to get adders
butterflies often the same too, if they don't settle
There's a few adder colonies in Eastern Moors just outside Sheffield, an area I used to walk quite often.
At various places, there's warning signs "Careful, Adders!" ...which on first few visits, I just thought meant "Careful you don't get bitten". I subsequently learnt it meant, if possible don't walk area at all, because you might disturb the poor wee snakes.
Walking across area one time with about half a dozen others, a snake came out..and my mate picked it up to explain it was a harmless grass snake. As he explained differences, I was thinking "That looks like an adder to me". He suddenly came to same conclusion, went white, put it down..and backed away.