ANZI

Your version is much closer to Summerst/Yoevil England verses of:
Black Bird also in the DT.....but from memory.

Wer be de black bird be?
Ah know wer he be
He be up yon werzel tree
That be wer he be

Now he see's ah
An ah see's he
Buggered (or jiggered) if ah don git um
Black-bird ah'll git ye.

Sincerely,
Gargoyle

Whoops NOPE - not in the DT - (can't imagine why - I posted over ten years ago.) So lyrics added. Learned it from swine-testicle-ripper from Sommerset.