Citizen Science: Crowdsourcing Bird Populations in Real Time

The New York Times:

Mr. Martinka, a retired state wildlife biologist and an avid bird-watcher, is part of the global ornithological network eBird. Several times a week he heads into the mountains to scan lakes, grasslands, even the local dump, and then reports his sightings to the Cornell Lab of Ornithology, a nonprofit organization based at Cornell University. 
“I see rare gulls at the dump quite frequently,” Mr. Martinka said, scanning a giant mound of bird-covered trash. 
Tens of thousands of birders are now what the lab calls “biological sensors,” turning their sightings into digital data by reporting where, when and how many of which species they see. Mr. Martinka’s sighting of a dozen herons is a tiny bit of information, but such bits, gathered in the millions, provide scientists with a very big picture: perhaps the first crowdsourced, real-time view of bird populations around the world.

Here's a link to a video.