Two warblers have been doing their best to confuse me over the last few springs… They are both fairly common around here.
Now you may look at those two pictures and think, “This WinterWoman person is crazy. Those two birds don’t look anything alike!” You may be right about the crazy part, and I do recognize the field marks of these two species… when they’ll let me see them. The Yellow Warbler is a little less shy and will flit before me when I walk the trails at Audubon. I almost never see the Chestnut-sided. Most often, though, I hear them first and see them later – if at all.
The Yellow Warbler’s song is often described with the phrase “Sweet-sweet-sweet-sweet, I’m so sweet!” Listen to it by clicking here (from Cornell).
The Chestnut-sided Warbler’s song is described as, “Pleased, pleased, pleased to meetcha!” Listen to it by clicking here (from Cornell).
Pretty similar. Pretty frustrating to a reluctant birder who is just trying to get it right… It took me a few seasons to add habitat clues: Near water? Probably the Yellow Warbler. Shrubby woods? Probably the Chestnut-sided.
I finally got around to reading accounts of these two birds after catching and banding both at Tom’s SWAT banding station. I was delighted to find that even the experts find the songs to be very similar. In fact, look what it says at the Cornell website:
Recent DNA-based studies indicate that the Chestnut-sided Warbler is the closest relative of the Yellow Warbler. Both sing similarly phrased songs, and Yellow Warblers regularly sing songs nearly identical to those of the Chestnut-sided Warbler. (source)
Ha! No wonder I was confused!
- Yellow Warbler: http://www.birds.cornell.edu/AllAboutBirds/BirdGuide/Yellow_Warbler_dtl.html
- Chestnut-sided Warbler: http://www.birds.cornell.edu/AllAboutBirds/BirdGuide/Chestnut-sided_Warbler_dtl.html