Rhododendron is similar in shape to pigeons, but slender in shape, with a dark gray upper body and a horizontal spot on the abdomen. A foot has four toes, two toes forward and two toes backward. Flying very fast, very quiet.

Most rhododendrons live in forests in tropical and temperate regions. About two-thirds of rhododendrons, including all North American species, build nests and feed young; Only about 35% azaleas raise young birds in a parasitic way.

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Cuckoo will imitate the eagle's call to occupy the nest and lay eggs.

According to a recent paper published in the British magazine Nature, Ecology and Evolution, female cuckoos (also called cuckoos) will "cunningly" imitate eagles to fool reed warblers. It is found that after laying eggs in reed warbler's nest, female cuckoos will imitate the sound of eagles, distract reed warbler's attention and reduce the probability of finding cuckoo eggs parasitic in the nest.

It was found that reed warblers had the same alert response to the calls of female cuckoos and sparrowhawks, and they shifted their attention from bird eggs to their own safety. But they don't respond to the calls of male cuckoos and turtledoves. Then, the research team played these different calls to another kind of bird (tit), which is the prey of sparrow hawk, but not the host of cuckoo.

Tits also have the same reaction to the calls of female cuckoos and sparrows, which proves that the similarity between female cuckoos and sparrows has aroused vigilance.

Baidu Encyclopedia-Eriocheir sinensis

People's Network-Cuckoo will imitate the eagle's call to occupy the nest and lay eggs.