YOU SAID:

horses and ducks are different because one flies and the other runs

INTO JAPANESE

馬とアヒルは、一方が飛ぶのともう一方が走るという点で異なります

BACK INTO ENGLISH

Horses and ducks differ in that one flies and the other runs.

INTO JAPANESE

馬とアヒルは、一方が飛ぶことともう一方が走ることが異なります。

BACK INTO ENGLISH

Horses and ducks differ in that one flies and the other runs.