https://cowboystatedaily.com/2025/11/23/broken-dinosaur-tails-from-mating-injuries-may-reveal-which-fossils-belonged-to-females/
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It seems that while male dinosaurs got some tail, they might have broken some tails.
"We imply that they're mating injuries, which would imply that all the ones that bear those injuries should be female," said Denver Fowler, curator of the Dickinson Museum Center in North Dakota and one of the contributors to the new research. "It makes the most sense."