This guide is based on wikipedia's list of birds of Germany with accidentals removed to keep the guide under 500 entries.
The Common Swift (Apus apus) is a medium-sized bird, superficially similar to the Barn Swallow or House Martin but somewhat larger. It is, however, completely unrelated to those passerine species, since swifts are in the separate order Apodiformes. The resemblances between the groups are due to convergent evolution reflecting similar life styles. Swifts' nearest relatives are ...more ↓
The Alpine Swift (Tachymarptis melba) or Apus melba, is a species of swift. The bird is superficially similar to a large Barn Swallow or House Martin. It is, however, completely unrelated to those passerine species, since swifts are in the order Apodiformes. The resemblances between the groups are due to convergent evolution, reflecting similar life styles.
The European Nightjar, Eurasian Nightjar or just Nightjar (Caprimulgus europaeus) is the only representative of the nightjar family of birds in most of Europe and temperate Asia.