Caged Bees (IMAGE) Penn State Caption The scientists conducted a laboratory cage study in which they placed bees in cages in the absence of floral cues. Instead of flowers, they presented the bees with fresh pollen from different plants. The scientist found that bees preferred pollen with higher P:L ratios. Credit Anthony Vaudo, Penn State Usage Restrictions non commercial use only 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.