Birds, by design, tend to be small, light and streamlined. Yet there are some that push the boundaries of size. Here is the avian world’s best example of an ultra-heavyweight flyer. Birds of prey are ...

The giant moa was the world’s largest bird, up to 11 feet high and 500 lbs., a peaceable, plant-eating giant that lived on the edges of forests in New Zealand’s South Island. Then the island’s first ...