Photos: Data collecting is for the birds

These birds are fully equipped with "backpacks" for their journey. The 37-gram packs contain GPS receivers, air pollution sensors and a digital camera. The pollution sensors detect a number of potentially harmful gases such as carbon monoxide and nitrogen dioxide. The pigeons send data and photographs to a blog that is updated in real time. The results are displayed on the blog in the form of an interactive map.

Photo by PigeonBlog