According to evolution, dinosaurs lived during an age when birds and non-reptile land creatures were either present in just a few "primitive" forms or not at all. But a recent National Geographic online interview offered a summary of fossil discoveries made in a dinosaur-bearing deposit in Madagascar.

A piece of oxygen-darkened amber was said to hold a particular arachnid, but it wasn't clearly visible. Scientists made a surprising discovery when a computed tomography scan was able to produce a finely detailed three-dimensional image of a hunting spider. But if the amber is actually 49 million years old, as is claimed, why hadn't it completely darkened long ago?

The Green River Formation, a sedimentary feature of Wyoming and northern Colorado, is widely recognized for its high quality fossils of fish and other creatures. It has been dated at 40 million years and older. What are the odds, then, of original soft tissue fossils being found encased in its rock?

A massive fossilized spider has set a new size record. It looks like today's golden orb-weavers, which are large enough to dine on small birds. This discovery, in conjunction with similar ones, presents problems for evolutionary origins, and also shows how a name choice can be misleading. What did scientists decide to name this fossil, and why?

The skull of a previously unknown dinosaur with interesting teeth and a unique head shape was uncovered in Ghost Ranch, New Mexico.