
These are species with at least one recorded territory in Germany, not a national checklist: a bird list from eBird or Avibase is more complete. The counts follow recording effort as much as wildlife, so a country with more visitors and more naturalists will show more of both.
The species with the most open occurrence records in Germany, among those a photograph exists for. Most recorded is not most numerous: it rewards animals that are common, conspicuous and live where people go.

Capreolus capreolus

Vulpes vulpes

Corvus corone

Dendrocopos major

Columba palumbus

Parus major

Circus aeruginosus

Alopochen aegyptiaca

Cyanistes caeruleus

Sus scrofa

Bufo bufo

Certhia brachydactyla
The reference database has no regions filed under Germany.
The field guide covers Germany on the map, but none of its species have an entry written for them yet.