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

Prosthemadera novaeseelandiae

Larus dominicanus

Rhipidura fuliginosa

Gerygone igata

Zosterops lateralis

Anthornis melanura

Chroicocephalus novaehollandiae

Tadorna variegata

Hirundo neoxena

Turdus merula

Haematopus unicolor

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