The origins of vivid colors within the gemstone ammolite—a rare type of brightly colored fossilized ammonite shell—are ...

Ostriches are the biggest birds on the planet today. Males can tower 9 feet tall, half of that their neck, and weigh in at more than 300 pounds. But there was once an even bigger bird, the elephant ...

Skeleton season may be just around the corner, but the skeleton age dawned with the early Cambrian Period, about 538 million to 506 million years ago. In this time span, most major animal groups ...

Before they were driven to extinction, giant elephant birds roamed Madagascar, weighing up to 2,000 pounds and towering 10 feet tall. A new analysis gives hints as to how many species there once were.