BLOOMINGTON - Michael Masters was 7 years old and at the Brookfield Zoo when he first saw a blue and gold macaw. "It let out the biggest scream," he said.

michael_swan / Flickr / CC BY-ND 2.0. At 45,000 square feet, Bird Kingdom in Niagara Falls, Canada is the largest indoor free-flying aviary in the world. Home to more than 350 birds, the privately ...