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

Hypsipetes madagascariensis

Cinnyris sovimanga

Dicrurus forficatus

Copsychus albospecularis

Centropus toulou

Terpsiphone mutata

Foudia madagascariensis

Falco newtoni

Merops superciliosus

Zosterops maderaspatanus

Neomixis tenella

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