Hedgehogs are nocturnal, and come out when the sun goes down. Their sense of smell puts our human nasal abilities to shame, and they can even sniff out prey an inch under soil. When faced with a sense of danger, they curl up into cute little balls and protect themselves with their dense layers of thick spikes.
And when we talk about rambling, well, hedgehogs would put Alfred Wainwright to shame. They can clock up to 2km every night, given the appropriate network of dense neighborhood shrubbery. And this is the key, maintaining a garden that is friendly to hedgehogs is to create a haven for all sorts of other wildlife, including birds, insects and all manner of interesting creepy crawlies.