Which bird builds mud nests, typically on cliffs or buildings?

Swallow

Who is credited with creating the TV series "Grey’s Anatomy"? In volleyball, how many points are required to win one set under standard rules? Which European explorer gave thanks in 1541, predating the Pilgrims' feast, near Palo Duro Canyon in modern-day Texas? Who is Monica and Ross's mother? Who developed calculus independently from Isaac Newton?