"What is the fastest-growing outdoor activity in the U.S.? Snowboarding? Mountain biking? No. It’s bird watching! There are currently 51.3 million dedicated birders in the U.S. with their binoculars focused on the skies. Sure to appeal to this growing flock, 100 Birds to See Before You Die is the ultimate birdwatcher’s book. Selected by two world-renowned birding authors, the top 100 birds include avian species that are endangered, exce ..."