Swainson's Thrush
Catharus ustulatus
Summary 3
Swainson's thrush (Catharus ustulatus), also called olive-backed thrush, is a medium-sized thrush. It is a member of Catharus genus and is typical of it in terms of its subdued coloration and beautiful voice. Swainson's thrush was named after William Swainson, an English ornithologist.
Description 4
This species is 16–20 cm (6.3–7.9 in) in length. The wingspan averages at 30 cm (12 in) and the wing chord is 8.7–10.5 cm (3.4–4.1 in). The bill measures 1.5–1.9 cm (0.59–0.75 in) in length and the tarsus is 2.5 to 3.1 cm (0.98 to 1.22 in) long. This species' body mass can range from 23 to 45 g (0.81 to 1.59 oz). This thrush has the white-dark-white underwing pattern characteristic of Catharus thrushes. Adults are brown on the upperparts. The underparts are white with brown on the flanks; the breast is lighter brown with darker spots. They have pink legs and a light brown eye ring. Birds in the east are more olive-brown on the upperparts; western birds are more reddish brown. This bird's song is a hurried series of flute-like tones spiralling upwards.
Sources and Credits
- (c) Bill MacIndewar, some rights reserved (CC BY-NC), uploaded by Bill MacIndewar
- (c) Alejandro Bayer Tamayo, some rights reserved (CC BY-SA), https://www.flickr.com/photos/alejobayer/16209993949/
- Adapted by Bill MacIndewar from a work by (c) Wikipedia, some rights reserved (CC BY-SA), https://en.wikipedia.org/wiki/Catharus_ustulatus
- (c) Wikipedia, some rights reserved (CC BY-SA), https://en.wikipedia.org/wiki/Swainson's_thrush
