Buckets (IMAGE) Washington University in St. Louis Caption Researchers set up a mosquito nursery in these buckets so they could determine how the presence of an invasive species impacts the parasite load of the native species. Credit Kim Medley / Tyson Research Center Usage Restrictions For Editorial Purposes 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.