Villagers and Cattle on Dirt Road (IMAGE) University of California - Davis Caption Villagers and cattle along the road near Pimperena in southern Mali. A UC Davis study reports that mosquito preference for human versus animal biting has a genetic basis. Credit Yoosook Lee/UC Davis Usage Restrictions Provide credit 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.