Reference: Birds shifting north global warming cited, Bangkok Post, February 11, 2009
It is reported that from 1966 to 2005 the annual surface temperature in the United States went up by an average of 3 Celsius degrees due to global warming and that as a result half of the 305 species of migratory birds studied that fly south for winter compensated for the increased temperature by cutting short their southward migration by an average of 56 km (Birds shifting north global warming cited, Bangkok Post, February 11, 2009). These findings are inconsistent and incomplete. It is not possible to compensate for 3 Celsius degrees of warming by moving only 56 km northward. Also the report fails to explain why the other half of the 305 species was left out of the study and whether the findings are biased by this omission.