The Palate of a Koala (IMAGE) Kyoto University Caption Koalas have more bitter taste receptor genes than most mammals and functional receptors for both sweetness and umami. Credit Kyoto University / Takashi Hayakawa 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.