Out of all 9,700 species analyzed, four birds reached what the researchers call the "billion club," or species with an estimated global population of over a billion. These included the house sparrow at 1.6 billion, the European starling at 1.3 billion, the ring-billed gull at 1.2 billion, and the barn swallow at 1.1 billion.
The article is here - https://apple.news/A3f5PODRHT5yv3bNxPIBUSA
The article is here - https://apple.news/A3f5PODRHT5yv3bNxPIBUSA
