In the case of the European cuckoo, the offspring of the foster-parents are commonly ejected from the nest within three days after the cuckoo is hatched; and as the latter at this age is in a most helpless condition, Mr. Gould was formerly inclined to believe that the act of ejection was performed by the foster-parents themselves.
Europako kukuaren kasuan, kukukumearen gurasotzakoen ondorengoak kukua arrautzatik irten eta hiru egunen buruan habiatik kanpora jaurtikiak izaten dira normalean; eta kukukumea adin horretan zeharo baliaezina izaten denez gero, Gould jauna hasieran aiher zen uste izatera gurasotzakoak berak zirela jaurtikitzen zituztenak.