The way I learned "thou poor bird", it had three verses:

Thou poor bird,
mournst the tree,
where sweetly thou didst warble
in thy wand'ring free.

Ah, poor bird,
take thy flight
far above the sorrows
of this sad night.

Ah, poor maid,
shed thy tears,
your love has fallen
and will not return to you.

Hope this helps a bit. We sang it in round against

"Rose rose rose rose,
will I ever see thee wed?
I will marry at thy will,
sire, at thy will."

((as was mentioned above))

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