Based on growth marks, the team also estimated one of the individuals to be at least two years old and still growing at the time of its death, supporting the growing body of evidence that pterosaurs had long incubation periods.

"We know there are more eggs and embryos in the field, and we will spend much more time in studying this incredible pterosaur," Wang said.

In an accompanying article, Denis Deeming of University of Lincoln in Britain, touted the work as "a crucial advance in understanding pterosaur reproduction."

"Wang et al.'s study is remarkable for the number of eggs in association with adults and juvenile pterosaurs that it reports on," Deeming said.

"This finding provides support for nest-site fidelity, but as the authors suggest, this specimen does not represent the nest site itself, and many questions remain unanswered."

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