Where I work, it is normal at this time of year for me to see at least 2 or 3 grass snakes every day when walking round the grounds. In good years I have often had 6 or 7 a day. But my most recent sighting was October last year - nothing at all this year. Has anyone else noticed a similar drop in numbers? I can't see that the habitat has changed significantly, so I am wondering what has happened to them.