LIMINKA (FINLAND), May 14, 2016 -- A ruff is seen in the wet land in Liminka Bay, Finland on May 13, 2016. Liminka Bay, located in northwestern Finland, is one of the most valuable bird habitats in Europe, where can watch over 200 different species of birds annually, more than 160 of which nest in the area. Every spring, migrants begin to gather here. It is a preferred place for bird watching and bird photography in Finland. (Xinhua/Zhang Xuan)