Fossil bird eggs are known from six Thanetian (Eocene) localities in Provence, France. Their structure is similar to that of the eggs of large ratites. In size, they are intermediate between those of the living ostrich and the Quaternary Aepyornis. Two closely similar species are probably represented. In the absence of skeletal remains, it cannot be determined whether the eggs belong to an as yet unknown large ratite or to Gastornis.