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

Turdus falcklandii

Milvago chimango

Larus dominicanus

Tachycineta leucopyga

Zonotrichia capensis

Vanellus chilensis

Sephanoides sephaniodes

Curaeus curaeus

Mimus thenca

Zenaida auriculata

Leistes loyca

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