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Dinosaurs have been unearthed on every continent, including Antarctica.
These high latitude discoveries have initiated many questions on whether dinosaurs were endotherms, ectotherms, or some combination in between; whether they migrated towards lower latitudes to avoid winter cold and darkness; or if they actually lived at these polar locations all year round.
Extinctions have also occurred in all other periods of geological time.
The subject of extinctions is rather controversial due to The most singular extinction event in the supposed history of life was not the End Cretaceous disappearance of the dinosaurs, but the End Permian demise of most groups of marine and terrestrial animals.
Some dinosaur extinction theories postulate that dinosaurs died from the cold, while others suggest the beasts died from the heat, or else it was too hot in the summer and too cold in the winter.
Occasional monospecific bone-beds and the rarity of fossils of very young dinosaurs suggest a catastrophic death and burial.
The billions of dinosaur tracks recently discovered provide testimony to unusual, stressful conditions.
However, they all vanished from the earth in the global events at the end of the Cretaceous.
The cause poses a difficult question for which no ready answer is apparent.’Worldwide distribution of the 199 sites where dinosaur eggs have been found. The fragile eggs were easily broken and then dissolved in groundwater.
Many of the imaginative theories for the extinction of the dinosaurs will also be presented.