The effect of nearby animals on man-biting rates was tested under both outdoor and indoor conditions. Under outdoor conditions, fewer mosquitoes were found biting man when a carabao was nearby than when none were close. When collecting indoors, the opposite results were obtained. Therefore, placing a carabao near a house is disadvantageous. Sporozoite rates of Anopheles flavirostris were twice as high from man-biting collections as those caught from carabao. Placing carabao around a village but away from the house could play a significant role in reducing malaria transmission.