Well for example we've shown that red foxes have strong preference to pouncing in a north-eastern direction, and in other directions their accuracy plummets. It's believed that this is due to geomagnetic sensing.

We've studied how the blue photoreceptors in our retinas are actually magnetoreceptive, meaning in the right conditions, suspended in a fluid, they'll align the the Earth's magnetic field just like a compass needle.

I'd read before that this technique was theorized to be used in fruit flies, with the photoreceptors suspended in a fluid in the eye. But more recent studies have failed to replicate the geomagnetic sensing capabilities of fruit flies.

It's still nuts to imagine what that might look like. Distortions in your vision from magnetic sensing sounds so neat.