Grey Wolf (Canis lupus):

The Grey Wolf is the largest member of the Canidae family. The fossil record suggests that Gray Wolves originated in Eurasia (Old World) and came to North America (New World) approximately 300,000 years ago. Once widely distributed across North America, the Gray Wolfwas extirpated from much of its original range by the mid 1930s due to targeted eradication and habitat destruction associated with the arrival of European explorers about 500 years ago. In the United States, the Gray Wolf was listed as endangered under the Endangered Species Act (ESA) in 1973 and several legal battles occurredover whether they have recovered sufficiently to warrant delisting. On December 21, 2011, Secretary of the Interior Ken Salazar announced that Grey Wolves in the Great Lakes States had recovered and would be removed from the Endangered Species List. 

In Canada, Grey Wolves are not considered at risk of extinction and are therefore not listed under the federal Committee on the Status of Endangered Wildlife in Canada (COSEWIC) nor with the provincial Committee on the Status of Species at Risk in Ontario (COSSARO). In western North America, Grey Wolves do not hybridize with Coyotes living in the same geographic region.

Height: 26-32 inches (.7-.8m) at the shoulder
Weight: up to 171 lbs (78 kg); Males are typically heavier and taller than the females
Pelage: Varies from all white to all black to seal grey 
Lifespan: 7-8 years in the wild, but some have lived 10 years or more. Lower in exploited populations
Litter Size: 2-7 pups. 
Age at Dispersal: 11 – 24 months 
Pack size: 5 – 20
Territory Size:tends to increase with latitude, but typically between 1,000 – 2,000 km2