A morphometric analysis by López-Martínez and Vicens in 2012 found that it was an intermediate shape between avian and nonavian theropods, and also very similar to an Enantiornithine egg from the Bajo de la Carpa Formation in Argentina, though their microstructures are quite different.
A morphometric analysis by López-Martínez and Vicens in 2012 suggested based on its shape that "Sankofa" was an avian egg. It is very similar in shape to an Enantiornithine egg from the Bajo de la Carpa Formation in Argentina, though their microstructures are quite different.