A Dynamic Nectar Mop (video) Brown University Loading video... Caption Cally Harper of Brown University explains how the bats she studied have evolved to lap up extra nectar using blood-filled "hairs" on their tongues. She also discusses how they could inspire new technologies. Credit Michael Cohea/Brown University Usage Restrictions with credit 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.