Dinosaurs

208 million 65 million Allosaurus Alvarez animals Apatosaurus Archaeopteryx archosaurs asteroid impact birdlike body bones book Dinosaur caused ceous claws climate change coelurosaurs cold-blooded continents crater creatures crocodiles Cuvier Deinonychus developed Dinosaur Heresies discovered Don Lessem early earth ectotherms eggs endotherms eruptions evolved feathers feet long flight fossil geological geologists hadrosaurs heat Horner huge Iguanodon iridium John Ostrom K-T boundary Kings of Creation land Late Creta Late Jurassic layer legs lived lizard maiasaurs mals mammal-reptiles mammals Mantell mass extinction meat eaters meat-eating Megalosaurus Mesozoic metabolism million years ago modern birds Mysteries neck nests North America nosaurs Oort cloud orbit Paleontologist David Norman paleontologists plant eaters predators prey Protoavis reptiles reptilian Ricqlès Robert Bakker rock sauropods says Sereno shocked quartz skeleton skull species suggested supernova survive tail Tarsitano teeth temperature theory theropods thousand tons tooth tree volcanic warm warm-blooded wings