“Bees use polarized sunlight scattered by the atmosphere in order to navigate; they always know where the sun is, even if it’s cloudy or behind a mountain. Then they waggle dance to inform their hive-mates about food source locations.”

https://kottke.org/26/01/an-optical-compass-inspired-by-bee-vision

10.5 min video in link discusses polarization and why the sky gives us polarized light, and then gets into making an optical compass using this. It finishes up with how bees use this and the waggle dance they use to tell the hive where food is.

This brought back a faint memory of reading something years ago. Vikings may have used something similar to navigate at sea. Not proven to be real, but I found it interesting. https://en.wikipedia.org/wiki/Sunstone_(medieval)