Eurasian Hoopoe or simply Hoopoe is a bird of Upupidae family. In fact, it's the only species left from that family! Hoopoe's distinct feature is its crown. What I noted while taking its photographs was that the crown opens when the bird gets cautious or concerned, or while making sounds. See the 7th photo that has Hoopoe's crown partially opened. If you notice closely, the pose is of alert status, opening the crown a bit. Isn't it amazing?