Photo by Steve Maslowski |
Cornell’s Lab of Ornithology website AllAboutBirds.orgwrites, “The Wood Thrush is a consummate songster and it can sing “internal duets” with itself. In the final trilling phrase of its three-part song, it sings pairs of notes simultaneously, one in each branch of its y-shaped syrinx, or voicebox. The two parts harmonize with each other to produce a haunting, ventriloquial sound.”
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