David (1981), The wolf: The Ecology and Behaviour of an Endangered Species, University of Minnesota Press, p. David (1970), The wolf: The Ecology and Behaviour of an Endangered Species, Natural History Press, ISBN 978-3-0 Mammal Species of the World: A Taxonomic and Geographic Reference (3rd ed.). (1829) Fauna boreali-americana, or, The zoology of the northern parts of British America, London : J. Reintroduction Wolves hunting bison in Yellowstone National Park Its ears are also shorter, and its fur bushier. Sir John Richardson described the northwestern wolf as having a more robust build than the Eurasian wolf, with a larger, rounder head and a thicker, more obtuse muzzle. pambasileus), was reported as 39 kg (86 lb) and 40 kg (88 lb), respectively. lupus) and the Interior Alaskan wolf ( C. In comparison, the mean adult weights of its nearest rivals in size, the Eurasian wolf ( C. The Northwestern wolf is also one of the longest wolf subspecies, as its length usually ranges from 5 to 6 ft (152-183 cm) and can reach as long as 7 ft (213 cm). Here the weight of males was reported at between 45 and 72 kg (99 and 159 lb), while the females were reported at 36 to 60 kg (79 to 132 lb). More recent studies have reported the average range of height and weight in the north-west of the United States, both sexes were between 68 and 91.5 cm (26.8 and 36.0 in) tall at the shoulder. In Yellowstone National Park, adult females were average about 40 kg (90 lbs) and adult males average about 50 kg (110 lbs), with a mean adult body mass in winter of 46.4 kg (102 lb). In British Columbia, Canada, five adult females averaged 42.5 kg or 93.6 lbs with a range of 85 lbs to 100 lbs (38.6 - 45.4 kg) and ten adult males averaged 112.2 lbs or 51.7 kg with a range of 105 lbs to 135 lbs (47.6 - 61.2 kg), with a weight range for all adults of 38.6 kg to 61.2 kg (85 - 135 lbs).

Northwestern wolves are one of the largest subspecies of wolves. occidentalis is the most widespread member of the four gray wolf subspecies in North America, with at least six different synonyms. nubilus populations as it advanced, a process which has continued until present times. It likely crossed into North America through the Bering land bridge after the last ice age, displacing C. occidentalis, the most northwestern subspecies, is descended from the last gray wolves to colonize North America. baileyi, each one representing a separate invasion into North America from distinct Eurasian ancestors. Īccording to one source, phylogenetic analyses of North American gray wolves show that there are three clades corresponding to C. He chose to give it the name occidentalis in reference to its geographic location rather than label it by its color, as it was too variable to warrant such. The subspecies was first written of by Scottish naturalist Sir John Richardson in 1829. This wolf is recognized as a subspecies of Canis lupus in the taxonomic authority Mammal Species of the World (2005). Arguably the largest gray wolf subspecies in the world, it ranges from Alaska, the upper Mackenzie River Valley southward throughout the western Canadian provinces, aside from prairie landscapes in its southern portions, as well as the Northwestern United States. The northwestern wolf ( Canis lupus occidentalis), also known as the Mackenzie Valley wolf, Alaskan timber wolf, or Canadian timber wolf, is a subspecies of gray wolf in western North America.

Timber wolf weight