Old World Swallowtail (Papilio machaon aliaska) Butterfly

Observation: The butterfly (Papilio machaon aliaska) is bigger than all the other ones I saw.

Resource:

Butterflies and Moths of North America – Old World Swallowtail Papilio machaon, Caterpillar hosts, Sagebrushes (Artemisia species), including Arctic wormwood and wild tarragon, rarely plants in the parsley family. Habitat is a open hilltops, mountain meadows, tundra and range in North America, south from Alaska to northern British Colombia, east across Canada to western Quebec. Southern British Colombia south through New Mexico. Comments: Includes , P. oregonius and P. bairdii.

Wikipedia – Papilio machaon, the Old World swallowtail, is a butterfly of the family Papilionidae. The imago typically has yellow wings with black vein markings, and a wingspan of 65–86 millimetres (2.6–3.4 in). The hind wings of both sexes have a pair of protruding tails which give the butterfly its common name from the resemblance to the birds of the same name. Just below each tail is a red eye spot.