Which country has the most significant number of endemic bird species?

The country with the most significant number of endemic bird species is Indonesia, which has over 400 endemic bird species. This is due to Indonesia's unique geography and diverse range of ecosystems, which provide habitats for a wide variety of bird species.

Indonesia is an archipelago made up of more than 17,000 islands, which are home to a diverse array of plant and animal species. The country's tropical rainforests, coral reefs, mangroves, and other ecosystems provide habitats for a vast array of bird species, many of which are found nowhere else in the world.

Some of the most well-known endemic bird species in Indonesia include the Bali myna, Javan green magpie, and Sumatran ground-cuckoo. However, there are many other species that are equally unique and fascinating.