OBSERVATIONS ON A YOUNG CUCKOO. 169 



16th. — The eyes have now a distinctly sunken appearance, 

 in part due to the erectile feathers of the Cuckoo's head, not 

 noticeable in other birds. 



17th. — The Cuckoo experiences a difficulty in breathing, every 

 respiration it takes being distinctly perceptible. 



18th. — For the last few days the Cuckoo has changed its 

 position. 



22nd. — The Cuckoo, aged twenty days, quitted the nest this 

 afternoon. 



23rd. — The Cuckoo nowhere visible, nor was it ever seen 

 again by me. 



