This traditional verse from a couple of other songs would fit, if you can't find the one you want.

The cuckoo is a pretty bird, she sings as she flies
She brings us good tidings, she tells us no lies
She sucks the small birds eggs to make her voice clear
And the more she sings cuckoo, the summer draws near.

No relationship to the Wild Rover that I can see, but it scans OK.