Adult Chimney Swift:
Summer Plumage:
- Dorsal: Pale black, with feathers edged in rufous and pale white.
- Face, neck, chest, and flanks: Gray-rufous, with black central spots on the feathers and pale white tips.
- Remaining ventral areas: White.
- Primary flight feathers: Pale black.
- Greater coverts: White tips. Other coverts are pale black-brown with rufous and pale white markings.
- Lateral tail feathers: White.
Winter Plumage:
- Dorsal: Gray, with a small brown spot in the center of the feathers.
- Ventral: White.
- Tertials: Brown, edged with pale white.
- Central tail feathers: Brown. Lateral tail feathers: Gray, all with white tips.
- Eyes: Dark brown.
- Bill: Black.
- Legs: Gray-brown or black.
Measurements (in mm):
- Wing: 118 – 129
- Tail: 52 – 62
- Tarsus: 23 – 26
- Bill: 21 – 26
Distribution:
This species nests in cold regions of Europe, Asia, and America. During the winter, it migrates south to India, Myanmar, Indochina, Borneo, and Australia.
Vietnam: This species is found in the Mekong Delta.