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The Swamp Sparrow has what can be called in most regions a cryptic song. What is meant by this, is it can sound very similar to some other species.
Its trill is similar to Chipping Sparrow, Dark-eyed Junco, Pine Warbler, and Worm-eating Warbler.
So how can you tell it apart?
For me, the song is brighter, bolder, and has more of a ringing to it. The frequency of the trill itself can vary a fair bit - from a slow trill where each note is distinguishable, to a faster trill that almost but never quite reaches that of a buzzing sound. It also helps that this would be a song you would expect in a wetland, so habitat hints can be used as well.
The swamp sparrow is also more likely to sing from an exposed perch, where it can be clearly seen.
Learning to identify birdsong by ear can be a satisfying skill for anyone who has interest in birds and nature. In this podcast, birdsong recordist Rob Porter introduces you to the songs found in various habitats across North America.
Recordings are by Rob Porter.
Cover art is by Lauren Helton. https://tinylongwing.carbonmade.com/