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

Haematopus ostralegus

Larus fuscus

Larus argentatus

Buteo buteo

Circus aeruginosus

Fulica atra

Anser anser

Ichthyaetus melanocephalus

Fringilla coelebs

Ardea cinerea

Columba palumbus

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