Magnetoreception

This month, Paul Donovan explores the hidden world of Magnetoreception in chickens.

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Chickens possess a remarkable, yet little-known ability - magnetoreception. This was first discovered in the 1960s by researchers studying bird migration and orientation. However, the specific discovery of magnetoreception in chickens is attributed to a group of German researchers in 1972, who demonstrated that chickens uses magnetic fields for orientation. The research was further enhanced in 2005, when scientists discovered magnetite, a magnetically sensitive mineral in chicken brains. These findings laid the groundwork for further research, revealing the intricate mechanisms of magnetoreception in chickens.

Magnetoreception is a capacity allowing certain groups of animals to detect and respond to the Earth’s magnetic field, effectively granting them a built-in compass. Chickens can perceive magnetic cues, influencing their behaviour, navigation, and even visual perception. This fascinating trait is shared with various animal species, including migratory birds, turtles, and monarch butterflies. However, the study of magnetoreception in chickens offers unique insights into the intimate relationships between biology, environment, and behaviour.

THE SCIENCE BEHIND MAGNETORECEPTION

Magnetoreception is a complex biological process involving the detection of magnetic fields by specialised cells or organs in the body. In chickens, magnetoreception is mediated by tiny magnetic crystals, composed of magnetically sensitive iron oxide, found in the brain, inner ear, and retina. These crystals respond to magnetic fields, triggering biochemical signals transmitted to the brain. The brain then interprets these signals, allowing the chicken to perceive magnetic information.

Chickens possess two types of magnetoreceptors: