bony inner ear of a squirrel monkey (IMAGE) University of the Witwatersrand Caption The bony inner ear of a squirrel monkey (in blue) and the soft tissues inside it (in red). Relations between bony and soft tissue structures have been studied in extant species to infer inner ear function in fossils and infer whether they were cold or warm-blooded. Credit Romain David Usage Restrictions No restrictions. License Public Domain Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.