THE CUCKOO. 79 



edge of the nest, throws them over. This hollow, 

 however, only remains for a certain time, and then 

 fills up; and it is an extraordinary fact, that if the 

 young birds are designedly kept in the nest till the 

 hollow is filled up, the young Cuckoo, as if aware 

 that it has no longer the power to get rid of them, 

 allows them to remain unmolested. 



