sentence: Litters are born in the early summer.
sentences_before: It takes 53 days for the pups to grow in the mother before they are born. The mother can produce 5-8 cubs but sometimes as many as 25. Both the mother and the father help to raise their young pups. The young females leave the family and form their own groups and the males stay with the family. Arctic Foxes form pairs in the breeding season.
sentences_after: The parents raise the young in a large den under the ground. The pups are born with brown fur and as they grow older it turns white.
concept_name: litter
headings: Arctic fox
categories: Foxes Mammals of North America Mammals of Asia Mammals of Europe