Common Least Skipper vs Green-Underside Blue

Ancyloxypha numitor compared with Glaucopsyche alexis

Key Differences

• Common Least Skipper is Least Concern while Green-Underside Blue is Near Threatened.

Taxonomic Classification

Rank	Common Least Skipper	Green-Underside Blue
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Arthropoda (Arthropods)	Arthropoda (Arthropods)
Class same	Insecta (Insects)	Insecta (Insects)
Order same	Lepidoptera (Butterflies & Moths)	Lepidoptera (Butterflies & Moths)
Family	Hesperiidae	Lycaenidae
Genus	Ancyloxypha	Glaucopsyche
Species	Ancyloxypha numitor	Glaucopsyche alexis

Evolutionary Relationship

Common Least Skipper and Green-Underside Blue share a common ancestor at the Order level: Lepidoptera. (Butterflies & Moths)

Conservation Status

Common Least Skipper

LC — Least Concern

Green-Underside Blue

NT — Near Threatened

Physical Characteristics

Attribute	Common Least Skipper	Green-Underside Blue
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Common Least Skipper

Habitat

Typically found in virtually all terrestrial and freshwater habitats.

Range

Distributed across Canada and United States.

Green-Underside Blue

Habitat

Typically found in virtually all terrestrial and freshwater habitats.

Range

Found across Europe (37 countries). Listed as Near Threatened, this species requires ongoing monitoring to prevent population decline.

Common Least Skipper

The Common Least Skipper (<em>Ancyloxypha numitor</em>) is a small butterfly in the family Hesperiidae, classified as Least Concern on the IUCN Red List. It is native to Canada and the United States, where it typically inhabits virtually all terrestrial and freshwater habitats within its range, showing a particular affinity for moist, grassy areas near water. The species is among the smallest skippers in North America, characterized by orange and brown wing coloration and a rapid, low-flying flight pattern close to vegetation. Adults typically nectar on small flowers while larvae feed on grasses, particularly those in wet meadows, marshes, stream margins, and disturbed grassy areas. The Common Least Skipper is frequently observed in wetland margins, wet prairies, and roadsides with rank grass growth. Its wide distribution across North America and habitat generalism across moist grassland and wetland types support its stable population and Least Concern conservation status. Biological traits of this species remain poorly documented in the scientific literature.