This is the 13037th most frequent Korean word.
동물을
"동물을" means "animal" in English.
The word "동물을" means "animals" and is used here as the object of the verb "좋아해요" (like).
동물을 좋아해요.
I like animals.
The word "동물을" is functioning as the object of the verb "보호하다" (to protect).
동물을 보호해야 합니다.
We must protect animals.
The word "동물을" is used as the object of the verb "돌보다" (to take care of), referring to animals in general.