the melon (called junk because sperm whalers couldn't get spermaceti from it) under it also serves echolocationy purposes, and is important to all ceteceans. they have smaller spermaceti organs, only the sperm whale has an unusually huge one
real ominous geographical energy to vector, now that i think about it. surrounded by a massive block of mountains on all sides, defended in every direction by a chokepoint. seems basically impossible to meaningfully launch an attack on. betcha it had more trees 50 years ago