The behavior shown in this video is called "inking", generally know for cephalopods to use as a "masking escape" technique. Basically the animal is spreading a thick cloud around itself so most predators can't see it anymore, giving the animal a slight advantage to escape.
By the time I shot this clip of a sperm whale in Dominica, Caribbean, I had no idea these giant mammals use this "inking" technique too.
When I saw the whale making jerky movements and squirting faeces, I thought she had intestines issues. I followed her but could hardly see her (the technique does work well).
After a while I thought may she might be annoyed by me, so I stopped following her. At that moment she stopped squirting/inking.
Later on I learned about this behavior with sperm whales and felt bad I followed her at first, but happy I felt intuitively I had to let her alone.
This behavior is better documented with Pygmy & Dwarf sperm whales (the little cousins of the Physeter macrocephalus), than with this giant.
