Climate change is causing birds to shrink

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Researchers analysed 70,716 specimens from 52 North American migratory bird species collected over 40 years. The birds had died after colliding with buildings in Chicago, Illinois.
The authors say the study is the largest of its kind and that the findings are important to understanding how animals will adapt to climate change. The paper was published in the journal Ecology Letters.
It builds on a growing body of evidence that suggests animals are shrinking as the climate warms.

Read more: BBC News