YOU SAID:

there was a large bird on my shoulder

INTO JAPANESE

私の肩には大きな鳥がいた

BACK INTO ENGLISH

There was a big bird on my shoulder.

INTO JAPANESE

肩に大きな鳥がついていた。

BACK INTO ENGLISH

There was a big bird on his shoulder.

INTO JAPANESE

彼の肩には大きな鳥がついていた。

BACK INTO ENGLISH

There was a big bird on his shoulder.