Thursday, May 5, 2011
Louisiana vs Northern Waterthrush
1) Throat. In these photographs, you can clearly see that the throat of the Louisiana Waterthrush is plain white, unlike the finely speckled throat of the Northern Waterthrush. This field mark is usually good, except these speckles can vary in both species.
2) Eyestripe. The Louisiana Waterthrush's eyestripe is white and broad (specially behind the eye). The Northern Waterthrush's eyestripe tapers to a point behind the eye and is often dusky.
3) Flanks. The flanks of a Louisiana Waterthrush are often buffy, contrasting with the white breast. This color may be subtle, as you can see in the photo above.
4) Leg color. Note the bright pink legs on the spring Louisiana Waterthrush in the photos above. The Northern Waterthrush tends to have dusky, horn-colored legs.
4) Size. Most Louisiana Waterthrushes are at least a quarter of an inch larger than Northerns. Good luck discerning this size difference in the field.
Peterson 1947). Thayer Birding Software graciously allowed me to use their copy-righted mp3 files of bird calls so that you can listen to the songs of the Louisiana Waterthrush and the Northern Waterthrush. Thayer Birding Software produces the DVD Birds of North America (Mac and PC versions available), which is well worth the price. This disk contains multiple bird photographs, videos, and bird calls of North American birds.
Posted by Dan Tallman at 12:54 PM