水でも飲みに降りてきたのかなーと思ったらこれですよ(^^;)
この子は益虫なので殺しちゃダメですよ！
ハエとかＧとか食べてくれます！

I wondered if it might be dropping down to take a drink, and then this happened. (^^;)

These little guys are useful arthropods, so you mustn't kill them! They eat flies and roaches and such for you!