Which preposition to use with bullfinch

in Occurrences 1%

" Her face fell, but she turned away that he might not detect her disappointment, and began to feed her bullfinch in the window.

like Occurrences 1%

If you want to steal a start, then fly the bullfinch like a bird; Gallop now your very hardest; turn him sharp, and jump the stile, Trot him at itnever mind the bough,it's only smashed your tile!

Which preposition to use with  bullfinch