Swainson’s thrush
Catharus ustulatus

Content and photos by Eliana Patt

On a wet May morning, a flutelike song bubbles up from the underbrush. The bird it belongs to hops into the light, singing his heart out between bites of mulberry.

This is a Swainson’s thrush, a migratory member of the thrush family Turdidae and, more specifically, the nightingale-thrush genus Catharus. Many members of this genus have beautiful calls, and the Swainson’s thrush certainly lives up to this reputation.

At first glance, a Swainson’s thrush may not seem to live up to the hype. With a solid brown back (either olive or russet depending on the population) and a spotted white chest, this species is well-camouflaged and is heard far more often than it is seen. The song, after all, is its most distinctive feature- and what a song it is!

The call of a Swainson’s thrush is enchanting and musical, spiraling upwards in notes that are almost magical in the early morning light. In the field, I often say that the song ‘sparkles,’ as to my ears every call sounds as if it should be surrounded with a handful of fading stars.

Of course, hearing a Swainson’s thrush is the easy part. Finding them is another matter entirely. In addition to their camouflage, Swainson’s thrushes have another ace up their wing- their behavior. A Swainson’s thrush skulks around thickets, where the dappled light breaks up its already fragmented profile into even smaller pieces. And the challenge isn’t over when a birder catches sight of a dapple-breasted Catharus thrush- as if finding them wasn’t hard enough, a Texas spring might boast four close relatives with similar patterning.

During spring migration, Swainson’s thrushes can be found alongside a number of warblers in the undergrowth of popular Austin birding sites.

These four relatives- the Veery, Gray-cheeked thrush, Wood thrush, and Hermit thrush- all feature spotting on their breasts, a brown back, and similar conformation. Wood thrushes are easier to separate, with distinct black spots on their light breast that contrast with both their own ruddy back and the lighter, more ‘smudged’ spots of a Swainson’s. Hermit thrushes can be distinguished by contrast as well, namely their cinnamon tail versus the brown of their backs. The spots of a Veery are far rustier and fainter than either those of a Wood thrush or a Swainson’s, with a reddish-brown back to match. Lastly, Gray-cheeked thrushes live up to their names, with a gray face and gray eyering that would be buffy on a Swainson’s.

Of course, the easiest way to tell members of all of these species apart is by their varied and beautiful songs. All Catharus seems to share this subtle woodland magic, the kind that can twist even a relatively uneventful birdwatching excursion into a fantastical journey.

And so, despite their small size and plain coloration, Swainson’s thrushes remain a jewel in the crown of a Texas spring. As the height of summer rolls on over our county, I can’t help but long to hear their calls again.

Source Used:
Cornell Lab’s All About Birds | Swainson’s Thrush