Since the position of the sunset changes with latitude and season, researchers think that these birds must be able to compensate for the changes by means of “a biological clock that tells them the time of year, ” says Science.
व हे घड्याळ त्यांना वर्षातल्या विशिष्ट काळाची सूचना देत असावे, ” असे साइन्स पत्रकात म्हटले आहे.