© Tim Laman/NGSAn African goshawk is seen on Bioko Island, Equatorial Guinea. Low amounts of a toxic substance give birds the ability to "see" Earth's magnetic field as they navigate on long journeys.
A toxic substance plays a key role in helping birds migrate, a new study says.Previous research had shown that birds seem to have an internal compass that allows them to "see" Earth's magnetic field. This magnetic vision guides them on long journeys.
Scientists have also studied a protein molecule, called cryptochrome, that drives the chemical processes behind the birds' magnetic abilities.
But what the molecule was reacting with to create birds' special sight has been a mystery - until now.
Due to a laboratory mishap, scientists have discovered that toxic superoxides may be the previously missed ingredient.