Young Sperm Whales attacked by Orcas have a unique defense

[Catherine]

A group of Orcas chased and surrounded some young Sperm Whales. The young whales were tired and in a dangerous situation. 
They gathered in a circle, their heads together and unleashed a "poo-nami". The Orcas back off quickly and then swam away.

https://nationalpost.com/news/science/sp...a-poo-nami

That is not a bad self defense technique. That much poop would gross out anyone. It is possible the Orcas suddenly lost their appetite, or at least their appetite for Sperm Whales.