 The large amount of variation among "Darwinopterus" specimens has been interpreted as sexual dimorphism.The first "Darwinopterus" specimen in which sex could be confidently identified was specimen ZMNH M8802 in the collections of the Zhejiang Museum of Natural History, nicknamed "Mrs T" (short for "Mrs Pterodactyl"), described by Lü Junchang and colleagues in January 2011.This specimen was preserved with the impression of an egg between its thighs in close association with its pelvis.