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Allans comment that dinosaur lifespans have been estimated by Chinsamy etc is
not quite correct. No one has estimated average lifespans of dinosaurs using
bone cross-sections. What has been calculated are average growth spans, but
the animals may live long after major growth has ceased. Nor did sauropods
grow as slowly as reptiles. Ring counts in a British sauropod (Reid, 1981
Nature) show that it reached about 8 tonnes in 29 years, an elephant like
rate far higher than observed in reptiles. Bigger sauropods probably had to
grow even more rapidly.