 Altogether, almost no major body part of pelagornithids is known from a well-preserved associated fossil and most well-preserved material consists of single bones only; on the other hand the long occurrence and large size makes for a few rather comprehensive (though much crushed and distorted) remains of individual birds that were entombed by as they lay dead, complete with some fossilized feathers.Large parts of the skull and some beak pieces are found not too infrequently.In February 2009, an almost-complete fossilized skull of a presumed "Odontopteryx" from around the Chasicoan-Huayquerian boundary c. 9 million years ago (Ma) was unveiled in Lima.