Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Greater Sac-winged Bat, Saccopteryx bilineata is a bat native to Middle and South America. They are the most common bats seen in the rainforest as they often roost on the outside of large trees. They are insectivores and use echolocation calls through the mouth to track their prey. The long nose and upper lip are highly mobile and can shift upward to enlarge the mouth opening.