"Sperm whales" refers to a type of large marine mammals that have a unique name because of a substance called "spermaceti" found in their heads. They are known for their massive size and ability to dive deep into the ocean. Full definition
Instead of merely learning about an aspect or two of sperm whale behavior in the wild, researchers got an unprecedented peek into one pod's gracious spirit. (treehugger.com)
It is interesting that such a carbohydrate reserve has not previously been reported for sperm whale nor indeed for any other whale nor needed for any other whale so far examined. (freetheanimal.com)
But living sperm whales have small teeth and typically do not use them to capture prey. (discovermagazine.com)