I heard and also saw grasshopper warblers while out collecting wild raspberries from a sort of hedge of thick bushes and vegetation at the side of a track. They are red listed and said to be less common in Scotland. I didn't know what the bird was but thought it would be a warbler and was easily able to identify it from recordings and video online. I was delighted anyway and think I would have missed it had I just been walking past. It's an amazing song- like a soft buzzing and like nothing else.