The calf "Dawn" in the Sacramento River in 2007 with the Antioch Bridge visible in the distance
Delta and Dawn, also known as the Delta whales, are two humpback whales, a mother and her calf, who entered San Francisco Bay in early May 2007. They swam up the Sacramento River approximately 90 nautical miles (170 km) upstream from the Golden Gate,[1][2] about 20 miles (32 km) further inland than Humphrey the Whale had gone two decades earlier. Under the Endangered Species Act, California state officials were required to rescue the animals.[1] Their journey was thought to be the longest freshwater incursion by humpback whales ever documented.[3]
^ abHughes, Sandra (May 30, 2007). "Delta And Dawn Home Free?". CBS Evening News with Katie Couric. cbsnews.com. Retrieved 14 August 2010.
^"Wayward Humpback Whales Start Heading Downriver". Fox News Channel. foxnews.com. May 21, 2007. Retrieved 14 August 2010.
^"Delta & Dawn: Sacramento River Rescue". Marine Mammal Center. marinemammalcenter.org. 2007. Archived from the original on 21 November 2010. Retrieved 14 August 2010.
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