Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Yungavolucris is a monotypic genus of enantiornithine bird. It contains the single species Yungavolucris brevipedalis which lived in the Late Cretaceous (Maastrichtian, c.70.6-65.5 mya). The fossil bones were found in the Lecho Formation at estancia El Brete, Argentina. Little is known about it because the only remains discovered so far are 6 tarsometatarsi, only one of which is nearly complete. This single foot bone, however, differs from all other birds in being very flat, and also very wide at the lower end. The specimens are small, just over 4 cm long, and if its legs and feet were not excessively shortened in relation to the body, the bird was about the size of a large blackbird in life. Y. brevipedalis had short, wide, and dorsoplantarly flattened "legs" (actually ankles) with disproportionally broad and splayed "feet" (actually the front part of the feet only) which seem to have pointed markedly outwards (Chiappe 1993).

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