Males have a mid-ventral penis. Testicles are abdominal. Cannibalism is common if female is stressed or disturbed. The male should be removed prior to parturition. If hand-raising is necessary, milk replacement formulas for either puppies or kittens works.
Hedgehogs are nocturnal and are quite active in the evenings.
If allowed to run in the house, they tend to skirt the walls, furnishings, and hide in corners or under furniture. May dig in carpets, or in houseplants and dirt if accessible. While young hedgies may be easy to handle and do not mind being held, many adults resist handling, and struggle to be let loose. Adult females tend to be more handleable than adult males. Many hedgehogs seem aloof and to not interact with humans, no matter how much handling they received when young.