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Green-winged Teal: Female decrescendo call slightly higher and huskier than Blue-winged Teal; distinctly higher and weaker than Mallard. • Female call is slightly higher, huskier, and longer than Blue-winged. • Male gives hollow, whistled notes, subtly two-parted, and much higher than Northern Pintail.
Credits:All text copyright Michael O'Brien. All sounds copyright Macaulay Library. Image copyright Brian E. Small.