"The snake is biting its tail."
Translation:Le serpent se mord la queue.
i still don't understand. since when is la/le a reflexive pronoun? I thought se/sa were reflexive. I think the "correct" answer is incorrect.
The reflexive pronoun is se. La is a definite article.
Literally, the French means "the snake is biting itself, the tail." It sounds funny in English, but this is absolutely the correct construction when the subject is doing something to its own body.
We've had a few of these before:
"Le garçon se lave les mains." The boy is washing his hands.
"La femme se brosse les cheveux." The woman is brushing her hair.