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]
- ^ a b Hughes, 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. Fox News. 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.