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Many theories regarding dinosaurs and their behavior are hotly debated by the experts. These include the debate over the grouping of birds with dinosaurs the question of whether nonavian dinosaurs were cold-blooded (ectothermic) or warm-blooded (endothermic) the question of whether dinosaurs protected and nurtured their young in the nest after hatching or whether the young were mobile and self-sufficient at birth and the reason for the disappearance of nonavian dinosaurs.
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