My husband is building a new house for a hedgehog. We help a hedgehog putting some dry hay inside the house and it can collect more if needed. It carries hay in it´s mouth and it is a huge work. The house is made waterproof. If it is warm days in winter and the snow is melting, water can´t get inside the house and wet a sleeping inhabitant and then freeze it when it is frost again. This house will be the third one under a huge pile of branches and dry leaves in a peaceful corner in our yard. My husband said that this easy to build and it is very important, because nowadays hedgehogs is very difficult to find a place for winter because of too clean gardens and yards.