description Delta and Dawn Overview
Delta and Dawn were a mother-and-calf pair of humpback whales that entered the Sacramento–San Joaquin River Delta in May 2007, swimming more than 60 miles inland from the Pacific Ocean. Both animals had sustained injuries, including wounds consistent with boat propeller strikes. Over roughly two weeks, rescue efforts included playing recorded humpback calls and forming boat corridors to encourage their return. The pair eventually swam back to saltwater on their own after the interventions.
help Delta and Dawn FAQ
Who were Delta and Dawn?
Delta and Dawn were a mother-and-calf pair of humpback whales that entered California's Sacramento-San Joaquin River Delta in 2007. Their unusual journey attracted widespread public and scientific attention.
How far inland did Delta and Dawn swim?
The whales traveled more than 60 miles inland from the Pacific Ocean. They reached waterways around the Sacramento-San Joaquin Delta, far beyond the normal coastal habitat of humpback whales.
Why were Delta and Dawn's injuries concerning?
Both whales had wounds consistent with strikes from boat propellers. Their injuries raised concerns about vessel traffic and the dangers that large boats can pose to whales in narrow waterways.
What happened to Delta and Dawn?
Rescuers and wildlife officials worked to guide the whales back toward the ocean after they entered the delta. Their case became a notable example of the difficulty of protecting marine mammals in busy inland waterways.
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