Humane snail trap Snails are lured by the smell of beer, which is poured in the middle of the product. By separating the beer in a special container, snails will not drown in the liquid compared with the traps you find on the market today.Once the snails are caught in the trap they can’t get out because there is a copper ring inside the product. Copper is gives a toxic reaction to the snails so the would not crawl over.