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As for how they find the food, they have a great sense of smell, and they seem to know their ranges very well, so if they’ve found food with you before, they will keep returning for more. Nic (one of the experts on here) theorises that they can follow scent trails, and my own experience seems to support this. I’m not quite sure how the hedgehogs get into my garden, but the route involves a squeezing around the side and back of my shed and weaving around multiple obstacles. I’ve lived here for two years and hadn’t seen a hedgehog in the garden before this summer, so we think that one hog managed to find her way in, repeated the route a few times cos she liked the garden, and other hogs followed her scent trail along the convoluted route. Nic says there’s no direct evidence for this theory, but it seems plausible.