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(a) Thresholded digital photograph of the bird's planform taken from directly below when the bird was gliding in a typical soaring posture with its wings fully outstretched (wing span = 1.9 m, from tip to tip). The irregular outline of the wings and tail reflects the state of the feathers, some of which were recently moulted. (b) Photograph of bird showing instrumentation unit mounted dorsally.
