Microolithus
... that some specimens of Microolithus, a type of Paleogene bird egg, preserve embryonic bones?
... that some specimens of <i id="mwB2k"><b id="mwB2o"><a href="./Microolithus" id="mwB2s" rel="mw:WikiLink" title="Microolithus">Microolithus</a></b></i>, a type of <a href="./Paleogene" id="mwB2w" rel="mw:WikiLink" title="Paleogene">Paleogene</a> <a href="./Bird_egg" id="mwB20" rel="mw:WikiLink" title="Bird egg">bird egg</a>, preserve embryonic bones?