But the song
of the hermit thrush challenges that conclusion.
Bruno Gingras (University of Vienna) and Dominik Endres (Philipps University of Marburg) then used two different statistical methods to demonstrate that the notes
of the hermit thrush song were, in most cases, simple integer multiples of a base frequency, corresponding to an overtone series.
A spectrogram
of a Hermit Thrush song shows the whistled introductory note (the horizontal bar at left) and the more complex song that follows.
Sean Roach and Leslie Phillmore of Nova Scotia's Dalhousie University gathered recordings
of Hermit Thrush songs from a number of databases, accumulating a sample of 100 individuals recorded across North America between 1951 and 2015.
«Genetic studies
of Hermit Thrushes in North America have defined three different groups of subspecies, with major splits most likely occurring as a consequence of two glaciation events.
Not exact matches
«Out
of the same brush pile we have flushed the common
hermit thrush of the northeast, the one that comes from the western U.S. and a race common in Alaska.
ONCE described as the finest sound in nature, for centuries birdwatchers have compared the song
of the North American
hermit thrush to human music.
The
hermit thrush is a common, medium - sized, North American songbird whose song has attracted the attention
of ornithologists and musicologists for more than a century.
The authors controlled for other possible explanations, such as the possibility that
hermit thrushes could select notes using the resonances
of their vocal tract in a manner similar to wind instruments like the alphorn.
Some
of the variation the researchers found likely dates back to isolation
of different
Hermit Thrushes populations by ice sheets during the Pleistocene era, while differences between the two western groups may relate to body size, with larger birds producing lower - frequency songs.
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Preferred habitat: along streams, edges
of woods + + + + Foliage / winter appearance: deciduous + + + + Soil conditions: loam, clay + + + + Light conditions: dappled shade to partial sun + + + + Plant spacing: 5 to 6 feet + + + + Wildlife value: the fruit is a favorite
of many birds; in summer its thick foliage provides good escape and shelter cover, as well as nesting sites, hark often used in nest building; fruit attracts the following birds: Mourning Dove; Red - bellied and Red - headed Woodpeckers, Eastern Kingbird; Blue Jay, Great Crested Flycatcher, Tufted Titmouse, Mockingbird, Gray Catbird, Brown Thrasher, American Robin, Wood,
Hermit, Gray - cheeked, and Swanson's
Thrushes, Eastern Bluebird, Red - eyed Virea, Yellow - breasted Chat, House and Fox Sparrows, Orchard and Northern Orioles, Scarlet and Summer Tanagers, Cardinal, Purple Finch, American Goldfinch, Rufous - sided Towhee