Cuckoo Proverbs

The cuckoo comes in April, and stays the month of May; sings a song at midsummer, and then goes away. (Traditional Proverb)
Everybody thinks his own cuckoo sings better than another's nightingale. View proverb
German Proverb
On April 8th, the cuckoo's call must be heard. If it isn't, either the cuckoo is dead or is going to die. View proverb
Corsican Proverb