User blog comment:Mckrongs/Monster Hunter 4 for the Nintendo 3DS/@comment-184.38.85.33-20120927214117/@comment-2194133-20120930012216

Well I do believe in one of the Concept Art pictures here was a cavern with bats coming out, maybe they are bats in the background to make it look more like a real ecosystem. Sorta like the random turtle in Area 1 of the Mountain Stream.