What species of bird is known for its elaborate courtship dance involving synchronized head and wing movements?

Albatross

Who opened the Chamber of Secrets fifty years before Harry's second year? What type of object was traditionally put in Irish windows on Halloween night to guide spirits home? What pagan festival celebrating the Winter Solstice influenced many Christmas traditions? Which member of The Beatles composed the song "Something"? What cause is important to Buddy and his family towards the end of 'Elf'?