What is the osprey related to?

The osprey ( fish eagle ) has it's own exclusive branch in the eagle family, the Pandionidae. In 18th century, the osprey was described by Carolus Linnaeus in its work, "Systema Naturae", and named the osprey as Falco haliaeetus. The genus Pandion was described by the French zoologist Marie Jules César Savigny in 1809.