Just got home after a week in Ibiza/Formentera, and saw about a dozen lizards (two in Ibiza city itself, by the big car-park!). Normally it's hundreds. Didn't see any snakes, or traps, but I kept to the footpaths around Salinas, the snakes probably avoid humans.
Or could the number of snakes now be declining as they are being trapped, and also their food source running out? If we can eliminate them, even from a small area like Salinas, hopefully somewhere there's a lizard captivity place where they are safe and can breed; and some be released back?
But the disappointing thing was how few there were on Formentera, which I hoped might be easier to clear the snakes as it's smaller than Ibiza.