This guide is based on wikipedia's list of birds of Germany with accidentals removed to keep the guide under 500 entries.
The Long-tailed Jaeger (Stercorarius longicaudus) (known as the Long-tailed Skua outside the Americas) is a seabird in the skua family Stercorariidae.
The Parasitic Jaeger, also known as the Arctic Skua or Parasitic Skua, (Stercorarius parasiticus) is a seabird in the skua family Stercorariidae.
The Great Skua (Stercorarius skua) is a large seabird in the skua family Stercorariidae. The name skua is believed to originate from the Faroese skúvur and is the only known bird name to originate from the Faroes which has come into regular use elsewhere. In Britain, it is sometimes known by the name Bonxie, a Shetland name of Norse origin.