I wanted to know about their seasonality, what time of year, this is when they first arrive, but how long are they around for? Does that give any clues?
계절적 특성을 알고 싶었거든요. 처음 언제 도착하는지는 알지만 얼마나 머무르는걸까요? 그게 단서가 될까요?