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

Cyanocorax cyanomelas

Furnarius rufus

Thraupis sayaca

Turdus chiguanco

Psarocolius decumanus

Brotogeris chiriri

Chroicocephalus serranus

Gnorimopsar chopi

Phalcoboenus megalopterus

Saltator aurantiirostris

Pyrrhura molinae

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