Fossils of these birds were found mainly in the phosphorus layers of Quercy in south-western France.

Several postcranial bones of the genera Gypsornis and Idiornis have been found, with the only species leaving behind an articulated skeleton with the skull intact.

[clarification needed]The limited fossil evidence suggested that Idiornithidae much resembled seriemas.

Until recently, idiornithids were commonly regarded as a suborder of the Gruiformes, but they are now classified as Cariamiformes.

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