Pigeons may be navigating with their liver, study suggests

NEW YORK -- A astonishing gut feeling whitethorn assistance pigeons find their mode home.

Animals usage assorted techniques to navigate including pursuing the stars and remembering cardinal landmarks. Birds, food and turtles orient themselves utilizing Earth's magnetic tract arsenic a compass. But it's not yet wide however precisely they bash this.

Pigeons are a well-known radical of predominant flyers that tin traverse hundreds of miles (hundreds of kilometers) successful a azygous day. For thousands of years, humans person utilized them to transportation news, notes and subject messages.

Scientists person agelong tried to untangle however pigeons question without getting lost. Some deliberation the birds observe magnetic cues utilizing light-sensitive molecules successful their eyes, portion others suggest it happens successful the beak oregon interior ear.

“The magnetic consciousness has been this enigma for astir 100 years,” said Martin Wikelski with the Max Planck Institute of Animal Behavior successful Germany.

In a caller study, Wikelski and different researchers decided to gully backmost the curtain connected pigeons' navigational secrets. They searched for magnetic clues successful the birds' organs and recovered a beardown awesome successful an unexpected place: the liver.

Specialized immune cells successful the pigeon's liver interruption down reddish humor cells and store iron. When scientists temporarily stripped pigeons of those immune cells and fto them fly, the birds “just couldn't find their way,” said Christian Kurts with the University of Bonn successful Germany. That suggested the iron-rich liver cells mightiness play a relation successful their consciousness of direction.

The birds' magnetic compasses lone got scrambled connected overcast days. That's due to the fact that they besides usage the prima arsenic a navigational guide.

Scientists person antecedently wondered whether immune cells could beryllium progressive successful magnetic sensing, but the caller survey published Thursday successful the diary Science is the archetypal to contiguous a full-fledged theory.

“I would ne'er person guessed it, but erstwhile it was explained to me, it makes sense,” said behavioral ecologist Albert Kao with the University of Massachusetts Boston, who had nary relation successful the study.

The immune cells are located adjacent nervus fibers successful the liver. That mightiness beryllium however they transmit their “magnetic sense” to the encephalon “and assistance the pigeons to navigate,” said survey co-author Clivia Lisowski with the University of Bonn.

The researchers deliberation different birds and animals similar mice could run utilizing a akin magnetic GPS. But extracurricular experts accidental much enactment is needed to verify the pigeons navigate this mode and to steadfast up however these signals get to the brain. While the researchers recovered the strongest magnetic awesome successful the pigeons' livers, specified immune cells person besides been spotted successful different areas including the beak and spleen.

It's imaginable this magnetic puzzle doesn't person a azygous answer, wrote veterinary pathologist Simon Spiro and biologist Hal Drakesmith successful an accompanying editorial. The birds could usage antithetic techniques to consciousness magnetic fields depending connected the task, beryllium it traveling agelong distances oregon uncovering a circumstantial destination.

“Indeed, it could beryllium prudent to person much than 1 mode of getting location successful the dark,” they wrote.

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