Sound localization by fish was long considered physically impossible, until it was shown behaviorally. How do they do it?
The fantastic Johannes Veith, Thomas Chaigne and team dove into this question with Danionella:
https://www.nature.com/articles/s41586-024-07507-9

News and Views:
https://www.nature.com/articles/d41586-024-01509-3

Podcast:
https://www.youtube.com/watch?v=4tmv4Hsfc3k&t=561s

The mechanism for directional hearing in fish - Nature

A study demonstrates that the fish Danionella cerebrum is able to discriminate the direction of sound by comparing the relative phase of pressure and particle motion.

Nature