Sources

https://commons.wikimedia.org/wiki/File:Howlsnow.jpg

https://pixabay.com/de/wolf-zoo-canis-lupus-hundeartige-725388/

https://www.nps.gov/npgallery/GetAsset/954C62C8-155D-451F-6713BDCD5FDB45D2/proxy/hires/

https://icanhas.cheezburger.com/tag/wolf-pack

https://commons.wikimedia.org/wiki/File:Mexican_wolf_pup_(6411046205).jpg

http://animal-jam-clans.wikia.com/wiki/File:Full-snow-wolf-pups-91.jpg

https://pixabay.com/de/husky-hund-hund-portr%C3%A4t-pelz-609553/

https://pixabay.com/de/retro-schwarz-wei%C3%9F-monochrom-1900253/