Photos and videos of nearly 1,500 dolphins being slaughtered were condemned across social media.
The whales are currently acclimatizing in a care facility at a first-of-its kind sea sanctuary before their eventual release.
"This type of feeding is very risky, as dolphins run the risk of remaining stranded," said researcher Daniele Cagnazzi.
The whales were observed in the Northeast Canyons and Seamounts Marine National Monument, located around 130 miles east-southeast of Cape Cod, Massachusetts.
For centuries, ambergris has been highly prized for its unique for its use a perfume ingredient.
The fatal wound, located above the right eye, measured around 6 inches in length and penetrated through to the top of the skull.
Researchers investigated a unique group of dolphins in Western Australia which use sponges as tools to forage for food.
Below the surface, the oceans are not as quiet as you might think.