International Day for Biological Diversity marked in Thessaloniki, Greece

Photo taken on May 22, 2018 shows a pair of Pelecanus Crispus flying above lake Mikri Volvi near the town of Thessaloniki, Greece. The United Nations has proclaimed May 22 the International Day for Biological Diversity to increase understanding and awareness of biodiversity issues. (Xinhua/Dimitris Tosidis)