Koloa in Water (IMAGE) Colorado State University Caption The koloa is a "petite, buffy brown and charismatic duck," similar to a female mallard. Credit Christopher Malachowski, Oregon State University 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.