Scientists study the perfectly preserved remains of an adolescent allosaurus they call 'Big Al.'
Dinosaurs are extinguished by an asteroid in prehistoric Idaho.
Dinosaurs' feeding and mating in prehistoric Australia.
Prehistoric flying reptiles.
Southern Europe once had giant seagoing reptiles.
Colorado was once a desert home to dinosaurs.
Dinosaurs of the Triassic period were predators and prey.
The lives of dinosaurs living in the shallow seas and skies of Europe and South America around 160 million B.C. and 125 million B.C.
New studies suggest how climate changes precipitated the rise and evolution of dinosaurs.
The alternating seasons of summer and winter dictate dinosaurs' habits; tyrannosaurs reign over North America.
Imaging technology and scientific collaboration depict dinosaurs in the wild.