Nearly 20 years ago, while repairing a fence on his ranch in Colombia, fossil collector César Perdomo found the middle leg bone of a bird. The 12-million-year-old fossil, known as a tibiotarsus ...

“If you were to take a time machine back to the end of the age of dinosaurs and encountered this animal, your first thought would probably be, ‘What a big, weird looking bird,’” Matthew Lamanna, a ...

Scientists have unearthed the fossilized leg bone of a colossal phorusrhacid, commonly known as a “terror bird,” dating back 12 million years in Colombia’s ...