Bats DO have ears.
Like all mammals, bats do have ears. In fact, bats have the most sensitive hearing at high frequencies of all mammals. Bats use their ears in a process called echolocation in which the bat sends out a high-pitched sound and interprets the returned signal to navigate and locate food.
The bat’s ear is highly adapted at assisting in echolocation. The outer ear plays a significant role in capturing the return signals and funneling them into the inner ear. The inner ear is equipped with a concentration of receptor cells that are highly sensitive to frequency changes. These signals are then funneled to the brain for processing.
“Molecular Evolution Is Echoed In Bat Ears.” Science Daily: News & Articles in Science, Health, Environment & Technology. N.p., n.d. Web. 15 Nov. 2011. http://www.sciencedaily.com/releases/2008/09/080904102756.htm
“How do bats echolocate and how are they adapted to this activity?: Scientific American.” Science News, Articles and Information | Scientific American. N.p., n.d. Web. 15 Nov. 2011. <http://www.scientificamerican.com/article.cfm?id=how-do-bats-echolocate-an>.