Monk Parakeets (IMAGE) University of Cincinnati Caption Monk parakeets are gregarious colonial-nesting birds that live in a social hierarchy. They are invasive species in the United States. Credit Michael Miller Usage Restrictions None License Licensed content 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.