From: http://www.cyberspacemuseum.com/diatryma.html
Diatryma is 2.1 meters tall.
Diatryma gigantea was a giant predatory bird that lived about 55 million years ago. Its fossils were found in the early Eocene aged Willwood Formation in Bighorn County, Wyoming.
From: http://www.cyberspacemuseum.com/diatryma.html