A new study finds an Australian moth follows the stars during its yearly migration, using the night sky as a guiding compass. When temperatures heat up, nocturnal Bogong moths fly hundreds of miles to cool down in caves by the Australian Alps. The moths are the first known invertebrates, or creatures without a backbone, to find their way across such long distances using the stars. Scientists put the moths in a night sky flight simulator and found that they relied on the night sky for direction. The study was published Wednesday in the journal Nature.