2010March12: North American songbirds have become lighter and grown shorter wings in recent decades in response to warming temperatures, according to a study that analyzed records of 486,000 individual birds (102 species) between 1961 to 2007 at a ringing station in Pennsylviania. The study, which was published in the journal Oikos, was led by Dr Josh Van Buskirk of the University of Zurich, Switzerland and colleagues Mr Robert Mulvihill and Mr Robert Leberman of the Carnegie Museum of Natural History in Rector, Pennsylvania (BBC).
Reference: BBC http://news.bbc.co.uk/earth/hi/earth_news/newsid_8560000/8560694.stm
Image Description: Rose breasted grosbeak. Photo by Joern Hauke, 2009May26. Image Location: Wikimedia Commons http://commons.wikimedia.org/wiki/File:Rose-breasted-grosbeak.jpg Image Permission: This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license.
