State of the World’s Birds is an annual review of environmental resources.
It is BirdLife International's flagship science publication.
According to the new review ‘State of the World’s Birds’, approximately 48% of existing bird species worldwide are known or suspected to be undergoing population declines.
The threat has been attributed to almost half of the 10,994 recognised extant species of birds to the expanding human footprint on the natural world and climate change.
The trend towards declining bird diversity is just as alarming in India, where recent annual trends have been calculated for 146 species.
Of these, nearly 80% are declining in numbers, and almost 50% plummeting strongly.
Just over 6% of the species studied show stable populations and 14% show increasing population trends.
Humans eat 14% of the world’s surviving species of birds.