
These are species with at least one recorded territory in Norway, 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 Norway, among those a photograph exists for. Most recorded is not most numerous: it rewards animals that are common, conspicuous and live where people go.

Corvus cornix

Larus argentatus

Larus canus

Bucephala clangula

Somateria mollissima

Parus major

Turdus merula

Turdus pilaris

Haematopus ostralegus

Cyanistes caeruleus

Chloris chloris

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