YOU SAID:

i am the greatest freind of the great birds

INTO JAPANESE

私は偉大な鳥の最大の友です

BACK INTO ENGLISH

I am the greatest friend of the great bird

INTO JAPANESE

私は大鳥の親友です

BACK INTO ENGLISH

I'm a big bird's best friend

INTO JAPANESE

私は大きな鳥の親友です

BACK INTO ENGLISH

I'm a big bird's best friend