Kelenken

The Kelenken is an giant flightless bird that lived in the Middle Miocene, some 15 million years ago, in Argentina. It is closely related to the Cariamiformes. It doesn't appear in any of the films or novels, but it does appear as a Glacier Park animal in Jurassic Park: Builder.

More real-life information: .

Trivia
The Kelenken uses the same animations of Gastornis.