Dogs could have an additional supersense - the ability to detect magnetic fields just like migratory birds.
Scientists say that dogs and other primates have a molecule in their eyes which could help them to use magnetic fields to help them perceive direction, altitude and location.
In the first study of its kind, researchers have found the cryptochrome 1 molecule in the retinas of 90 animal species - including dogs, wolves, bears and foxes.
While the cryptochrome 1 molecule has a hand in controlling the circadian rhythms of animals, it may also allow them to see the Earth's magnetic fields.
Scientists will now look closely at how cryptochrome 1 is used by mammals when seeing. At the moment, it is unclear exactly how dogs and primates use it.
However there are some clues to be gleaned from the hunting techniques of foxes. The wild animals are more successful at catching mice when they pounce on them in a northeast direction.
Scientists say primates may use it for bodily orientation, however it could just be an evolutionary trait that is no longer used.
The study was published in the Scientific Reports journal by researchers from Germany. It found that the molecule was not found in cat-like animals such as lions,and tigers.
It was already known that birds and bats possessed the useful molecule, with migrating birds using it to navigate using the Earth's magnetic fields.
But while cryptochrome 1 appears in orangutans, macaque monkeys and other primates - humans do not have them.
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