The lack of large numbers of fossils makes it hard to study sexual dimorphism in dinosaurs. But a new statistical approach offers insight into this question and others across science.
Tyrannosaurus rex spanned all of ancient North America, and about 20,000 lived at once.
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How do we know that bees were around when dinosaurs still roamed the Earth? The main evidence comes from fossils – the mineralized remains of long-dead organisms.