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With their head held down in a hunting position, they sweep their wings forward to meet in front of their head, thereby forming an umbrella shaped canopy. To achieve full canopy closure, the primaries and secondaries touch the water, the nape feathers are erected and the tail is drooped. The bird may take several strides in this position.
Juveniles elsewhere are often nearly all pure whitish below. By the time the young hawk-eagles reaches their 2nd to 3rd year, they tend to show less white above and more brown or black below. Their tail starts to molt to resemble that of adults in the 3rd year but in the 2nd year in N. c. limnaeetus (or at least in Philippines). Changeable hawk ...