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World is home to 50bn birds, ‘breakthrough’ citizen science research estimates Lisa Cox © Provided by The Guardian Photograph: Mike Bowers/The Guardian There are about 50 billion individual birds in the world, according to new research that uses citizen science observations to try to estimate population numbers for almost 10,000 species. The paper, led by scientists at the University of New South Wales, suggests there are about six times as many birds on the planet as humans – but that many individual species are very rare. Four species belong to what the researchers dubbed “the billion club”, with estimated populations greater than 1 billion. They are the house sparrow, found in many parts of the world, the European starling, the ring-billed gull and the barn swallow.

Sean dooleyMike bowersUniversity of new south walesGuardian researchGuardian photographNew south walesWill cornwellBirdlife australiaசீன் டூலிமைக் பந்துவீச்சாளர்கள்பல்கலைக்கழகம் ஆஃப் புதியது தெற்கு வேல்ஸ்பாதுகாவலர் ஆராய்ச்சிபாதுகாவலர் புகைப்படம்புதியது தெற்கு வேல்ஸ்விருப்பம் கார்ன்வெல்பறவை வாழ்க்கை ஆஸ்திரேலியா