Wildlife friendly ways to kill slugs and snails

I don’t like slug pellets.  Slug pellets have had a disastrous effect on the wild food chain – as well as killing slugs and snails, slug pellets harm hedgehogs, song thrushes, and other creatures.  Slug pellets kill these dear animals in the most cruel, drawn out, and painful manner.  Nothing could induce me to use slug pellets in my garden, allotment, or anywhere for that matter – however large the slug or snail population had become, and however many of my precious plants had been eaten.