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

Corvus splendens

Acridotheres tristis

Pycnonotus cafer

Psittacula krameri

Corvus macrorhynchos

Orthotomus sutorius

Halcyon smyrnensis

Eudynamys scolopaceus

Milvus migrans

Dicrurus macrocercus

Pycnonotus jocosus

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