Populations have been falling for decades, even in tracts of forest undamaged by humans. Experts have spent two decades trying to understand what is going on
Something was happening to the birds at Tiputini. The biodiversity research centre, buried deep in the Ecuadorian Amazon, has always been special. It is astonishingly remote: a tiny scattering of research cabins in 1.7m hectares (4.2m acres) of virgin forest. For scientists, it comes about as close as you can to observing rainforest wildlife in a world untouched by human industry.
Almost every year since his arrival in 2000, ecologist John G Blake had been there to count the birds. Rising before the sun, he would record the density and variety of the dawn chorus. Slowly walking the perimeter of the plots, he noted every species he saw. And for one day every year, he and other researchers would cast huge “mist” nets that caught flying birds in their weave, where they would be counted, untangled and freed.
