チャックウィルヨタカ vs Harmless Serotine

Antrostomus carolinensis compared with Eptesicus innoxius

Key Differences

• チャックウィルヨタカ is Least Concern while Harmless Serotine is Near Threatened.

Taxonomic Classification

Rank	チャックウィルヨタカ	Harmless Serotine
Kingdom same	Animalia (動物)	Animalia (動物)
Phylum same	Chordata (脊索動物)	Chordata (脊索動物)
Class	Aves (鳥類)	Mammalia (哺乳類)
Order	Caprimulgiformes (ヨタカ目)	Chiroptera (翼手目)
Family	Caprimulgidae	Vespertilionidae
Genus	Antrostomus	Eptesicus
Species	Antrostomus carolinensis	Eptesicus innoxius

Evolutionary Relationship

チャックウィルヨタカ and Harmless Serotine share a common ancestor at the Phylum level: Chordata. (脊索動物)

Conservation Status

チャックウィルヨタカ

LC — Least Concern

Harmless Serotine

NT — Near Threatened

Physical Characteristics

Attribute	チャックウィルヨタカ	Harmless Serotine
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

チャックウィルヨタカ

Habitat

Typically found in various aerial, terrestrial, and aquatic environments.

Range

Distributed across Colombia, Norway, and Venezuela.

Harmless Serotine

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Range

Found in Ecuador. Listed as Near Threatened, this species requires ongoing monitoring to prevent population decline.

チャックウィルヨタカ

The Chuck-will's-widow (Antrostomus carolinensis) is the largest nightjar in North America, named for its distinctive far-carrying call — a resonant four-syllable whistle repeated persistently on warm nights. It breeds across the southeastern United States, from the Atlantic coastal plain through the Gulf states and up the Mississippi Valley to southern Indiana and Kansas. The species migrates southward in autumn to winter quarters in the Caribbean, Central America, and northern South America. Like all nightjars, it is a crepuscular and nocturnal insectivore, capturing large moths, beetles, and other flying insects in flight using its enormous, bristle-fringed gape. By day, the Chuck-will's-widow roosts on the ground or along horizontal branches, relying on cryptic mottled plumage for concealment. It nests directly on the leaf litter of open woodland and scrub, typically in pine-oak forests, dry forests, and woodland edges. The IUCN classifies this species as Least Concern, though Breeding Bird Survey data suggest moderate long-term population declines linked to forest fragmentation and light pollution that disrupts insect prey availability. Conservation of large-scale woodland tracts in the southeastern United States benefits this species and its associated nightjar community.