The most well-known feature of rhododendron is that it is parasitic on eggs. This feature can be found in all species of Rhododendron subfamily and 3 species of Tamarinae subfamily, that is, they lay eggs in the nests of some kinds of birds, and their chicks are hatched and raised by adoptive parents. 47 species of Ericaceae have different adaptability to increase the survival rate of larvae: for example, the oval shape of Ericaceae resembles the egg of the host (mimicry), thus reducing the chance of the host to abandon it; The adult cuckoo will take one or more eggs from the host to avoid being seen by the host to increase the number of eggs and reduce the competition for the host chicks; Cuckoo chicks will push the eggs and chicks of the same nest owner out of the nest. Some rhododendrons are similar to the genus Eagle in appearance and behavior, and their hosts are afraid of them and can approach their nests without interference. So many people give cuckoo the title of "bad bird".