Every cuckoo that entrusts its eggs to other birds in this way chooses a particular species as foster parents, and lays eggs which closely mimic those of the foster mother. With so many other birds rearing the cuckoo's offspring for it, it is as if they were treating the cuckoo as their king.
每一種「托卵」給其他鳥的杜鵑，又個別選擇一種鳥作為寄子的對象，它們產卵還以「代母」所產的卵做藍本，以假亂真。