Wolf pups are born completely blind and deaf, but do have a very keen sense of smell.
Usually 4 to 6 pups are born together, this is called a litter. The pups inside are called litter mates. The pups live and are born in a den. A den is usually a small cave or burrow in which a family of wolves can be safely protected and live in.
A pack may have multiple dens, such as is a pack is nomadic it may have dens in areas for winter and summer.