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What are the two main mechanisms animals use to detect magnetic fields?
Light-dependent magnetoreception and magnetite-based magnetoreception.
What is light-dependent magnetoreception?
A system involving specialized photoreceptors in the eye that respond to magnetic orientation; birds require light to stay oriented.
What is the role of cryptochromes?
These light-sensitive pigments change depending on magnetic field direction, allowing birds to “see” magnetic fields as visual patterns.
What is magnetite and how does it work?
is a magnetic mineral found in many animals’ bodies, especially in the head. It deforms in magnetic fields, stimulating nearby receptors.