As they eat every other plant in it.

Consequently why doesn't somebody make an eco friendly weed killer that you spray onto weeds that makes it attractive to slugs and snails. A slug n snail pheromone so to speak. That way we could get them to do something positive with their lives that would benefit us rather than having to kill them all the time.

When you put a slug or snail on a sheet of glass and look at it's muscular foot from beneath, you see waves of dark and light bands moving from the back of the slug to its front.  I understand that these are muscular contractions that move in waves to propel the slug, but if they are moving from the rear of the slug to the front, shouldn't the slug be propelled backwards (ie - in the opposite direction to the motive force)?