Changeable Hawk-Eagle
Nisaetus cirrhatus
The changeable hawk-eagle is a largish but slender eagle. They fall near the middle of sizes among the currently accepted species in the genus Nisaetus. As in most birds of prey, females are larger than males with an average overall size difference of 7% but this can individually range to an 18-22% difference, with island races apparently thought to be less dimorphic on average. Voice: The changeable hawk-eagle is often largely silent but in breeding season it may readily call, both from their perch or on the wing. Like many diurnal raptors, their calls are a form of high-pitched scream.
ID text from Wikipedia, CC BY-SA 4.0
Mountain Hawk-Eagle
Nisaetus nipalensis
Voice: Mountain hawk-eagles are silent apart from their breeding season. Their call is a shrill treble note, with a quality often compared to a penny whistle. Their typical call is often likened to the klu-weet-weet of a green sandpiper (Tringa ochropus) or the kee-kikik of the common green magpie (Cissa chinensis). Sometimes the call is written in Japan as pie-pie-pie or pipipi.
ID text from Wikipedia, CC BY-SA 4.0
Where you might meet both
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Play today's Daily BirdPhotos and recordings are credited to their authors under the licence shown. Full profiles: Changeable Hawk-Eagle and Mountain Hawk-Eagle.