http://www.huffingtonpost.com/2011/10/1 ... 3%7C104851
WASHINGTON -- From the mighty polar bear to the tiny house sparrow, many of Earth's species appear to be shrinking in size, a new study reports. And the authors think it's probably due to global warming, a little like wool sweaters that shrink when washed in hot water.
But other experts say that conclusion goes too far, blaming global warming for what may be natural changes.
The new research was published online Sunday in the journal Nature Climate Change. It's based on a review of other studies and found that 38 of 85 animal and plant species showed a documented reduction in size over decades, including a type of Scottish sheep that is 5 percent smaller than in 1985. Those studies looked at species over different time periods and in varying numbers.