Researchers studying 15,000 birds in the Amazon rainforest found that nearly all of the birds' bodies have become lighter since the 1980s, losing on average about 2% of their body weight every decade, according to a new study.
Sign up for CNN's Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Birds' bodies are shrinking in response to climate change, even in places like the Amazon rainforest that are relatively untouched by human hands.
Researchers have studied information on more than 15,000 non-migratory birds spanning 77 species over a 40-year period that were captured in the Amazon rainforest, tagged and then released. The scientists found that nearly all of the birds' bodies have become lighter since the 1980s, losing on average about 2% of their body weight every decade, according to a new study published Friday in the journal Science Advances.
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