Historically, Daya Bay had whales and turtles. The bay was one of the breeding grounds along the southern coast of China for Asian population of gray whales, which are now one of the most endangered whale population in the world. They migrated to the bay to calve in the winter-spring seasons. Other species, such as humpback whales, also historically migrated to Daya Bay. All of these were wiped out by Japanese whalers established whaling stations on various sites on Chinese coasts including at nearby Daya Bay. Critically endangeredChinese white dolphins and occasional whales such as humpbacks have been confirmed in the bay in recent years.