Prosthemadera novaeseelandiae novaeseelandiae
Notice the sky shining through a gap in the third feather to the end… this notch on what is called the 8th primary feather can be used by the bird to make a whirring sound in flight. The 4th to 7th primaries have a bulge instead of a notch (which can also be seen). Males have larger wing slots, and the noise making is typically produced when the bird is displaying aggression.
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