swiftlets bird fly over the water in hala-bala wildlife sanctuary near bang lang reservoir in yala.

aerodramus animal asia bala bang bird birds birdwatching blue branch color comata fly flying forest fresh glossy green hala halabala hemiprocne illustration isolated jungle landscape lang mountain natural nature needletail nest park peninsular rainforest reservoir sanctuary scenery south summer swift swiftlet swiftlets thailand throated treeswift tropical water whiskered white wild wildlife yala