The bird lived 25 to 28 million years ago and boasted the largest-known avian wingspan in history, about 6.1 to 7.4 meters. That approaches the wingspans of ultralight airplanes and hang glider ...

It's called one of the largest community science projects in the world, and you can take part from your own backyard. The Great Backyard Bird Count kicks off tomorrow and runs through this coming ...