Hieraaetus kienerii

Because it has a black crest on the top of its head, its forehead, top of its head, back neck, and sides of its head are also black, and have a slight metallic luster, so it is easier to distinguish it from other eagles. The upper body is black, the throat and upper chest are white, with a few thin black vertical stripes, the rest of the lower body is brown chestnut, with black vertical stripes on the lower chest, the tail feathers are dark gray brown, with dark horizontal spots, and the primary flight feathers are in the middle when flying. A large round pale spot is visible at the base.
The upper body of the young bird is brown with light feather edges and a black central stripe; the broad white eyebrow lines extend forward and are connected with the white on the forehead; the cheeks and sides of the neck are mixed with tawny white, and have a thin black central stripe; the tail Dark brown with wide black horizontal spots and narrow pale tips; lower body white with slight yellowis

Distributed in Bangladesh, Bhutan, Brunei, Cambodia, China, India, Indonesia, Lao People's Democratic Republic, Malaysia, Myanmar, Nepal, Philippines, Sri Lanka, Thailand, Vietnam. Migrant bird: Singapore.
It is divided into 2 subspecies. It is only found in Hainan and Yingjiang, Yunnan in China. It belongs to the nominate subspecies (some people think it is the Indonesian subspecies, or Hainan is the Indonesian subspecies and Yunnan is the nominate subspecies). The distribution in Hainan is based on the records of early documents. It is a resident bird in Yunnan and is extremely rare.
The brown-bellied falcon eagle lives in broad-leaved forests and mixed forests in low mountains and foothills.

Rufous-bellied Hawk Eagle is a medium-sized bird of prey with two subspecies.

Rufous-bellied Hawk Eagle mostly moves alone, is not good at singing, often stands on trees or between grass on the ground for a long time, and sometimes flies in the air. When flying, the wings flap frequently, and the speed is extremely fast and flexible. It mainly feeds on animals such as chickens, kingfishers, pigeons, and mice. The main way of foraging is to ambush in the bushes or grass, waiting for the animals to come and then suddenly attack, and sometimes run on the ground to chase prey. In the open space in the forest, sometimes stand on isolated trees or fly in the sky, observe and look for prey, and suddenly dive down to catch them after finding them.

The breeding season of the brown-bellied falcon is from mid-December to mid-March of the following year. It usually nests on the top branches of tall trees in dense forests. The structure of the nest is huge and rough, mainly composed of dead branches, and padded with fresh green leaves. Each pair usually has two nests to choose from, sometimes using this one and sometimes using the other. If the breeding is successful, the old nest can be used for many years. Usually one egg is laid per nest, and the egg is laid on the green leaves in the nest. If the green leaves wither, the parent birds will replace them with fresh ones in time. The color of the eggs is dark grayish white, some have small light red spots, some have thicker spots, and sometimes have light purple or blue-gray bottom spots. The parents take turns to incubate the eggs, and they are very protective of the nest and territorial, especially during the breeding period, when they become more fierce and more aggressive.

Listed in the "Red List of Endangered Species of the World Conservation Union" (IUCN) 2018 ver 3.1-Near Threatened (NT).

Listed in the "Washington Convention" CITES Appendix II Endangered Species.

Listed as a rare species in the "China Red Book of Endangered Animals·Birds".

Listed as the second level of China's "National List of Key Protected Wildlife" (February 5, 2021).

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