Diatryma gigantea

This extinct bird grew as tall as a basketball player and weighed over 150 kilograms (330 pounds)! It also had heavy legs and tiny wings. Of course, this big bird couldn't fly. Diatryma fossils have been found in North America and Europe, from a time 10 million years after the extinction of most dinosaurs.

Scientific Name: Diatryma gigantea 
Pronunciation: die-uh-TRY-muh jy-GAN-tee-uh
Meaning: "double hole"
Locality Found: South Elk Creek, Big Horn Basin, Wyoming
Age: Early Eocene, 55 million years ago
Size: 2 meters (6.5 feet) tall
Characteristics: large-headed, flightless bird with short and heavy leg bones; beak indicates that Diatryma may have been a herbivore

Image credits: main image, Rick Spears; stumper, © AMNH.