Sperm whales exemplify the evolutionary drive for highly intense echolocation -- their nose is a massive sound generator that can take up as much as 1/3rd of the body size of an adult male.

The southern resident killer whales are threatened by depleted prey populations (mainly Chinook salmon), physical disturbances that interfere with echolocation, pollution and climate change ...

Southern resident orcas use echolocation to hunt prey ... whatever amount of prey is there more available to the whales,” WDFW killer whale policy lead Dr. Julie Watson said.

The intent is to reduce noise that interferes with the animals’ echolocation and provide ... apply to mammal-eating transient or Bigg’s Killer Whales who have been present in the Puget Sound ...