Hide menu

Domestic chickens recognize a tiger by smell

Like the leopard’s spots that have never changed, today’s domestic chickens react to the scents of predators – an inheritance from the jungle fowl they originated from, as shown in a study by researchers from both Linköping University and Stockholm University published in the periodical: Animal Behaviour.

höna med kycklingar

The study was conducted by Josefina Zidar, currently a doctoral student at Linköping University (LiU), and Hanne Løvlie, research associate at the Department of Physics, Chemistry and Biology (LiU).

This is the first time researchers were able to show that today’s domestic chickens can detect predators using solely their sense of smell. The chickens reacted to scents, like tiger droppings, with more watchful behaviour. However droppings from other prey animals like elephants or antelopes left them unaffected.

“Up until a couple of decades ago, it was believed that birds depended on sight and hearing in their everyday lives, and there is still the general idea that birds don’t make use of their sense of smell. But today we know that a number of bird species use smell for things like navigation, searching for food, and recognising fellow members of their species,” says Løvlie.

Whether domestic birds like chickens use their sense of smell – which is relatively weak – has until now been poorly researched. However the study, now being published in the British periodical Animal Behaviour, shows they do.

Tupp

Domestic chickens originate from Asiatic jungle fowl. They live in the rainforests, where visibility is often obstructed, and it’s of course an advantage if they can smell a predator before they themselves are detected. Even old Swedish dwarf chickens seem to know that the scent of a tiger means staying alert. Some 80 hens and roosters at the Tovetorp research station were observed for the study.

“That old Swedish dwarf chickens have inherited recognition of predators they’ve never been exposed to is a fascinating discovery. Not a dramatic reaction, yet when tiger droppings were put into the chicken’ yard, they stopped eating and became clearly alert,” Løvlie says.

The Kolmården Zoo supplied droppings from tigers, Asiatic wild dogs, antelopes, and elephants, which were presented to the Tovetorp flock in various proportions.

“We wanted to make sure that the chicken’ reaction didn’t depend on the fact that the predator droppings simply smelled stronger, so they were also tested with small amounts of predator droppings and large amounts from the elephants.”

The reaction was obvious. The chickens reacted to tigers and wild dogs, but not to droppings from other prey animals like elephants and antelopes.

Tigrar på Kolmården

“The few previous studies conducted on predator recognition in birds through smell yielded inconsistent results, where some birds displayed a response while others had no response at all. This means that there is very likely an explanation for why certain birds have this ability and others don’t, which for example could be connected to the birds’ ecology,” says Zidar, currently a doctoral student at LiU.

It may be that wild chickens use their sense of smell in several ways. Such as avoiding inbreeding:

“They don’t mate with close relatives, even those they didn’t grow up with. It might be that, for example, they can sniff out hens that are their siblings,” says Løvlie.

Article

Related Links


Gunilla Pravitz 2012-08-01



Academic boycott

Protestplakat mot Trumps inreseförbudLiU researchers have joined international calls for a boycott of scientific conferences in the US.

 

risky perfectionism

Woman putting on make upPsychology students took on role of treaters in a study of perfectionism and internet-delivered cognitive behavioural therapy.

 

social sustainability

People in motionSocial value creation is on the agendas of more and more companies and organisations. Erik Jannesson, senior lecturer in management control, has just published a book on the subject.

 

Critical of the national board of health and welfare

Rolf HolmqvistRolf Holmqvist is one of 17 researchers who are critical to guidelines for the treatment of depression and anxiety.

 

when researchers meet vulnerability

Child in SyriaMalin Thor Tureby was keynote speaker at an international conference on oral history.

 

global media hit

CatCats that meow with a dialect have caused a sensation in the world media. Robert Eklund, a linguist who works with cats at the Department of Culture and Communication, has lost count of the number of times the work has been reported in the media.

 

farewell exchange students

Farewell Mingle 2016On 6 December, a Farewell Mingle was held for departing exchange students who have studied at Linköping University.

 

success for new master's

Stefan Jonsson"We have a global and critical perspective that attracts today's students," says Stefan Jonsson, professor at REMESO, about the Faculty of Arts and Science’s first international master’s programme at REMESO in Norrköping - Ethnic and Migration Studies.

 

health is our new religion

YogisAchieving perfect health has become a religion in the western world, according to a newly published study. Barbro Wijma, professor emerita and physician with many years of experience meeting patients, views this development with dismay.

 

black in sweden

Victoria Kawesa

Skin colour matters, also in Sweden. But many people don’t accept that racism is a problem here – only in other countries. So claims doctoral student Victoria Kawesa, who writes about black feminism and whiteness in Sweden.

 

redress for neglect

Shadows of peopleJohanna Sköld from Child Studies at Linköping University co-organised an international workshop where researchers compared various models of compensation for institutional neglect and abuse.

 

tomorrow's nobel laureates?

Pupils from a primary school in Skäggetorp Anna Lindström and Monika Lopez of the Department of Culture and Communication applied earlier this year for funding for an initiative in an issue relating to refugees. The funding was granted, and the “Tomorrow’s Nobel laureates” project was born. 

 

Alumni of the year 1

Suad Ali, porträtt

Suad Ali, expert on Sweden’s refugee quota, works tirelessly for refugees worldwide. For her dedication she has been chosen as one of Linköping University’s two Alumni of the Year.

 

Alumni of the Year 2

Thomas-Lunner-i-studioThomas Lunner’s research has given improved hearing to millions of people with impaired hearing. He has been chosen as one of this year’s Alumni of the Year.


Page manager: anna.nilsen@liu.se
Last updated: 2017-02-13