D E N V E R, Aug. 1 -- Paleontologists have unearthed two exceedinglyrare skulls of a titanosaur, finally putting a face on one of theworld's most common, yet least understood dinosaurs. The skulls' ...

Some of these giant vegetarians were as tall as a 3-story building. Microscopic analysis of their teeth, bones and eggshells reveals how they grew, what they ate and even their body temperature.

And Madagascar has been an island for a long time. It separated from the Indian subcontinent 88 million years ago and has been on its own ever since. This allowed animals and dinosaurs on Madagascar, ...