Females often migrate to coastal areas to nest. Most populations migrate south in winter to temperate regions. They frequently migrate through brackish water estuaries to freshwater springs. When ocean waters cool, loggerheads must migrate to warmer areas or hibernate to some degree. These snakes will migrate large distances to brumate. Phocids tend to migrate more than otariids. Some migrate south in winter to spawn. This is significant, because it allowed them to migrate to cooler climates and thrive. Australasian ospreys tend not to migrate. They migrate out in early April into the Shubenacadie River to spawn. They were the first Filipinos to migrate en masse to the United States. This did nothing to win back users, who continued to migrate to Internet Explorer. In winter, they migrate to lower altitudes. Likewise, they often migrate to warmer waters whenever the water temperature dips below . The bats migrate to Mexico each winter.