YOU SAID:

Birds should know better than to fly upside down.

INTO JAPANESE

鳥は逆さまに飛ぶよりもよく知っているはずです。

BACK INTO ENGLISH

Birds should know better than flying upside down.

INTO JAPANESE

鳥は逆さまに飛ぶよりよく知っているはずです。

BACK INTO ENGLISH

Birds should know better than flying upside down.