It has a characteristic rattling-whinnying call and an undulating flight.
2.
Males undertake a song flight display, with a slight climbing and undulating flight above tree tops while singing.
3.
Both have an undulating flight, described as woodpecker-like, and the male has a loud, booming call.
4.
The male's display often consists of him first flying up in an undulating flight with wings readily held spread or closed.
5.
The song is a mournful " choo-wee-chacha wooee ", uttered from the ground or a boulder, or during undulating flight.
6.
This undulating flight is accompanied by a long low whistle at each dive and at the tip of each rise by a sharp " chilp " note.
7.
Like other goldfinches, it has an undulating flight in which it frequently gives a call : in this case, a harsh " chig chig chig ".
8.
The African goshawk is territorial and the typical courtship display is performed by both sexes where they fly together in an undulated flight while calling loudly, sometimes finishing with a steep dive.
9.
Little eagle nesting territories are defended against intruders and advertised by soaring, undulating flight display, conspicuous perching and / or calling ( Marchant and Higgins 1993; Debus et al . 2007; Bounds 2008 ).
10.
In flight, when the field marks are not easily seen, red-winged can be distinguished from less closely related Icterids such as common grackle and brown-headed cowbird by its different silhouette and undulating flight.
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