The binomial nomenclature of Grizzly Bear is Ursus arctos.
There are seven level of classification. Ursus arctos is composed of 2 levels, namely Genus and Species.
Here is the classification of the grizzly bear.
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Carnivora
Family: Ursidae
Genus: Ursus
Species: U. arctos ssp.