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birds and pterosaurs
In their article "Pterosaur diversity and faunal turnover in Cretaceous
terrestrial ecosystems in China (Nature437:875-879) Wang, et al., discuss
ecological relationships between pterosaurs and birds. They occur
sympatrically and both fly. the authors suggest "...that the avian fauna
of the Lower Cretaceous--and perhaps most of the Mesozoic era--was more
confined to terrestrial, inland regions, whereas pterosaurs dominated the
coastal areas." They worked in the Yixian formation.
While speculative, this is an interesting observation suggesting
ecological specialization of two flying groups.
Alan H Brush
92 High Street
Mystic, CT. 06355