Data from: Competition and constraint drove Cope's rule in the evolution of giant flying reptiles

Roger B. J. Benson, Rachel A. Frigot, Anjali Goswami, Brian Andres & Richard J. Butler
The pterosaurs, Mesozoic flying reptiles, attained wingspans of more than 10 m that greatly exceed the largest birds and challenge our understanding of size limits in flying animals. Pterosaurs have been used to illustrate Cope’s rule, the influential generalization that evolutionary lineages trend to increasingly large body sizes. However, unambiguous examples of Cope’s rule operating on extended timescales in large clades remain elusive, and the phylogenetic pattern and possible drivers of pterosaur gigantism are uncertain....
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