As the planet warms due to climate change, North American migratory birds are shrinking.
North American migratory birds are becoming smaller as the planet warms due to climate change, a new study finds.
So, what's causing birds to shrink, especially over such a relatively short time period? Scientists suspect that climate change is the most likely culprit, and birds are adapting accordingly. "We see that birds are getting smaller over time in response to temperature [change] and we're seeing the same thing over space," he said."For example, a cardinal living in a really warm area of the United States is going to be generally smaller than a cardinal in a very cold climate, so there's a spatial effect [that's occurring]."
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