What is Joseph's first job in the Booby household?

From the text:

At ten years old (by which time his education was advanced to writing and reading) he was bound an apprentice, according to the statute, to Sir Thomas Booby, an uncle of Mr Booby's by the father's side. Sir Thomas having then an estate in his own hands, the young Andrews was at first employed in what in the country they call keeping birds.

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