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Ostriches Are The Largest And Fastest Flightless Bird In The World, And A New Study Suggests That It May Be Because They Have Two Knees On Each Leg

Ostriches are the largest bird in the world, and also the fastest (on land anyway). This seems like a contradiction, but it is true. These birds can run up to 69 kilometers per hour (43MPH) even ...
Forbes

A Biologist Spotlights The World’s Most Aggressive Bird. Hint: It’s Flightless, It’s Not The Ostrich, And It’s Been Known To Kill People

Forbes contributors publish independent expert analyses and insights. I write about biodiversity and the hidden quirks of the natural world. When we think of flightless birds, aggressive is probably ...
Smithsonian Magazine

Why Have Birds Never Gotten as Big as T. Rex?

A Haast’s eagle attacks a moa pair. John Megahan, PLOS Biology, 3(1): e20 via Wikipedia under CC By 2.5 Evolution has a fondness for big birds. During the past 66 million years, repeated on different ...