YOU SAID:
Feathers are getting harder.
INTO JAPANESE
羽は難しくなっています。
BACK INTO ENGLISH
Feathers are more difficult.
INTO JAPANESE
羽はより困難です。
BACK INTO ENGLISH
Wings is more difficult.
INTO JAPANESE
翼はより困難です。
BACK INTO ENGLISH
Wings is more difficult.
That didn't even make that much sense in English.