It's fascinating to think about animals using biomagnetism, but the truth is that scientists haven't found definitive evidence of any animal using biomagnetism in the way we might imagine, like using magnetic fields to navigate or communicate.

Here's what we know:

* Magnetoreception: Some animals, like migratory birds, sea turtles, and some species of fish, are known to possess a sense of direction that is thought to be influenced by Earth's magnetic field. This is called magnetoreception.

* How they do it: Scientists are still figuring out exactly how magnetoreception works. There are a few leading hypotheses, including:

* Crystalline magnetite: Some animals have tiny crystals of magnetite in their bodies, which could act like tiny compass needles.

* Chemical reactions: Other theories suggest that magnetic fields might influence chemical reactions within the body, triggering a response in the nervous system.

However, it's important to note:

* No definitive proof: While there's strong evidence for magnetoreception, there's no conclusive proof that animals actively use magnetic fields for navigation, communication, or other purposes.

* Limited understanding: Our understanding of how magnetoreception works is still incomplete.

* Not "biomagnetism" in the typical sense: The term "biomagnetism" often refers to the magnetic fields generated by living organisms (like the electrical activity in our brains), not necessarily the ability to sense or manipulate magnetic fields.

So, while we can't say for certain which animals "use" biomagnetism, it's clear that many animals possess a sense of magnetoreception, and understanding how they use this remarkable ability is a fascinating area of ongoing research.