The Rodriguez Flying Fox Bat is a medium-sized bat that is about 12 inches long. its coloration is silvery and blackish-brown. There is no tail. The area between the shoulders is often yellow or grayish-yellow. They maintain a body temperature of 96 - 104 degrees Fahrenheit (33-37 degrees C). They have a very noticeable characteristic odor.
They normally roost in trees by day, and colonies may utilize the same roosting site year after year. During daylight hours, the noise level and the amount of motion of other bats will cause some individuals to fly from one location to another that is less chaotic. The range is maintained by this constant activity.
At dusk they fly to fruit trees to feed. Some drink sea water, apparently to obtain mineral salts lacking in the plant food.