Birds in North America are 'shrinking' because of climate change
Studies have shown that the size of birds in North America have changed over the years and that they may have become smaller - and scientists are blaming it on climate change.
A larger study has begun on this by Dr Josh Van Buskirk who is based at the University of Zurich, Switzerland.
Also working on the project is Robert Mulvihill and Robert Leberman both at the Carnegie Museum of Natural History in Rector, Pennsylvania.
With warmer temperatures occurring they believe the change happened in the last half a century. The researchers also believe that these changes haven't caused any harm to the birds.
Songbirds in the US are getting smaller, and climate change is suspected as the cause.
A study of almost half a million birds, belonging to over 100 species, shows that many are gradually becoming lighter and growing shorter wings.
This shrinkage has occurred within just half a century, with the birds thought to be evolving into a smaller size in response to warmer temperatures.
However, there is little evidence that the change is harmful to the birds.
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Arlington, Virginia, United States