"Hummingbirds are the lightest birds in the sky. Of their roughly 240 spe­cies, all confined to the Western Hemisphere, the largest, an Andean 'giant,' is only eight inches long; the smallest, the bee hummingbird of Cuba, is just over two inches long and weighs a single gram.

"Hummingbirds are the lightest birds in the sky. Of their roughly 240 spe­cies, all confined to the Western Hemisphere, the largest, an Andean 'giant,' is only eight inches long; the smallest, the beehummingbird of Cuba, is just over two inches long and weighs a single gram.