ML617394739
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观察细节
NOTE: I have edited my original species designation from 'New world warbler species' to Swainson's Warbler. I was at Bridge 288 when I heard the vocalization captured in the recording. It sounded like a Swainson's Warbler to me. I never saw the bird. I had Merlin running, and it also ID'd the vocalization as a Swainson's Warbler. At the same time, there was a singing Louisiana Waterthrush at Bridge 289. The two bridges are close to each other. A couple of minutes later, the Swainson's Warbler moved to Bridge 289 because I heard it singing there, on the river side of the bridge. The Louisiana Waterthrush was singing on the opposite side of the bridge. It seemed the two individuals were counter-singing. Their songs overlapped once. But I could distinguish the difference between the two vocalizations during this encounter. One was clearly a Louisiana Waterthrush; the other was the bird that sounded like a Swainson's Warbler. This counter-singing behavior might suggest that both of these individuals were males of the same species (Louisiana Waterthrush?) in competition for the same territory. This is one reason I originally hesitated to ID this bird as a Swainson's Warbler. Another reason is because I've been confused by these two species before. And I have wondered whether certain populations of Louisiana's Waterthrush can have songs that more closely resemble the Swainson's Song in areas where those species overlap (and maybe vice versa). I have taken two kayak trips on the Roanoke River and found that, in certain cases, it was challenging to discern the difference (especially when distance from the bird and my poor hearing might muffle the jumbled bits at the end of the Louisiana Waterthrush song). And while most Swainson's Warblers have a lazier, less hurried song, I have heard some individuals express a version of their song that is more hurried than typical. A visit to MacCauley's library reveals the various capabilities of these songsters. I welcome further discussion on this topic. One additional point, after hearing/recording this bird, it went silent, so I played the song of a Swainson's Warbler (just once) from the Sibley app (a recording from Florida). In my experience, most Swainson's Warbler males respond aggressively to playback. But in this case, the bird in question did not appear to respond. However, after a lengthy pause, a little brown bird did fly over the path and dive into dense vegetation just above eye level. It never reappeared. I did not use playback again. There may be ethical concerns with overuse of playback in cases like this. I used Audio Rec to make the recording. I used Audacity to clean up the recording (removing a loud noise from a phone notification at the 7-second mark).
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- 2.54 MB