Global Bird Shrinkage: Indigenous Knowledge Reveals 80-Year Trend

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Birds Shrinking Globally: Indigenous Memory & Science Reveal 80-Year Shift

A global study reveals birds are becoming smaller as large species disappear. (Image: Canva)

M

Moneycontrol•05-03-2026, 12:02

Birds Shrinking Globally: Indigenous Memory & Science Reveal 80-Year Shift

•Global bird communities are undergoing a significant transformation, with large species disappearing and smaller ones becoming increasingly common.
•A study combining scientific data and Indigenous observations across 40+ locations revealed an 80-year trend of declining bird body size.
•Average bird weight in observed ecosystems dropped from 1.5 kg in the 1940s to 535 grams today, a 72% reduction in some regions.
•Deforestation, habitat destruction, climate change, hunting, and human expansion are driving the disappearance of larger, more vulnerable birds.
•The loss of specific bird species also leads to a cultural cost for Indigenous communities, highlighting biodiversity loss as a social issue.

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