Note to King Lear, 1.4.215


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King Lear,
Act 1, Scene 4, line 215
cuckoo: —The cuckoo is notorious for being a brood parasite, which means that it lays its eggs in other birds' nests, so that those other birds will hatch and care for the cuckoo chicks.
Cuckoo chick [left] being fed by its "foster parent"
Cuckoo
Source:
www.telegraph.co.uk