Hummingbird on Flower (IMAGE) University of California - Riverside Caption Longer flower tubes are often associated with more specialist pollinators, like the black-chinned hummingbird visiting Nicotiana glauca seen here, whereas a greater variation of different pollinators can access the flower rewards of shorter and wider flowers. Credit Ninad Thakoor 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.