Description
Many enantiornithine fossils are found in highly fragmentary states, and some taxa are known only from a piece of a single bone. Particularly exquisite specimens that are complete, in full articulation and with soft tissue preservation are known from Las Hoyas in Cuenca (Spain) and the Yixian Formation in Liaoning (PRC). They have been found in both inland and marine sediments, suggesting that they were an ecologically diverse group. Enantiornithine fossils appear to include waders, swimmers, fish-catchers, and raptors. The smallest are described as sparrow-sized, but some were much larger, such as Avisaurus which had an estimated wingspan of 1.2 meters (4 ft).
Read more about this topic: Euenantiornithes
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