close-up view of hippopotamus head emerging from lake water. animal appears curious, watchful. big hippopotamus in natural

hippopotamus hippo swimming wildlife nature underwater muzzle portrait head animal river lake pachiderm huge looking camera closeup watching wild big abstract background habitat national fats herbivore zoological kingdom submerged nose snout face eye nostrils curiosity danger fisheye surprise funny ferocious fauna beast effect lens fish staring gaze curious photo