Odor that smells like blood: Single component powerful trigger for large carnivores

People find the smell of unpleasant, but for predatory animals it means food. When behavioural researchers at Linköping University in Sweden wanted to find out which substances of blood behavioural reactions, they got some unexpected results.

Matthias Laska is professor of zoology, specialising in the sense of smell. For some time his focus has been on scents that directly affect the behaviour of animals.

“For predators, food scents are particularly attractive, and much of this has to do with blood. We wanted to find out which chemical components create the scent of blood,” he says.

The study, conducted at Kolmården Wildlife Park, found that for the animals, one particular of blood odour was just as engaging as the blood odour itself.

“It's a completely new discovery that raises interesting questions on evolution,” says Prof Laska.

The study has been published in the scientific journal PLOS ONE.

When Prof Laska did a search for the contents of volatile substances in mammalian blood, he found nothing. Human blood has been analysed for disease markers, but we have very little information on the substances that give blood its characteristic scent.

A master's student was sent to Friedrich-Alexander-Universität in Erlangen Germany, to analyse mammalian blood with the help of gas chromatography and mass spectrometry, methods used for separating and identifying chemical compounds in a sample. The machine detected some 30 substances, of which some are decomposition products from fats. But the machine lost the job to the human scent experts who had also been engaged. They identified scents that the gas chromatograph missed completely.

One substance stood out: an aldehyde called trans-4,5-epoxy-(E)-2-decenal, which emits the typical metallic scent that humans associate with blood.

Once the researchers had identified a scent candidate that the predators should be attracted to, they wanted to test whether the predators were actually attracted to it in reality. So they designed a study to be conducted at Kolmården Wildlife Park, involving four predator species. How would the four predators — Asian wild , African wild dogs, South American bush dogs and Siberian tigers — react when they caught a whiff of the scent?

Half-metre long wooden logs were impregnated with four different liquids: lab-produced aldehyde, horse blood, fruit essence, and a near-odourless solvent. The animals were exposed to one scent per day in their regular enclosure, while a group of students carefully observed their behaviour.

The results were unequivocal. The logs containing aldehyde were just as attractive stimuli as those containing blood, while the two other logs aroused little interest. The commonest behaviours were sniffing, licking, biting, pawing and toying. The tiger was the most persistent, while the South American bush dogs lost interest more quickly than the other species.

The study is the first to show that

… Continue reading here.
Dogs News — Sciencedaily


Wild Dogs Hunt Down an Impala

Warning: Contains Graphic Content: A week ago, Nat Geo WILD embarked on a three-month safari in Kruger National Park in Africa for Safari Live, bringing viewers a live safari from the heart…

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    • Daniel Medeiros
    • November 12, 2014

    Bicho burro esse impala. Mereceu mesmo ter sido devorado ainda vivo.

    • ashleylac2000
    • November 12, 2014

    I wished that the dogs would of kill it before ripping her flesh off like

    • Shimura Shinpachi
    • November 12, 2014

    Race Start!

    • RacerEckss
    • November 12, 2014

    Holy shit!

    • mike packham
    • November 12, 2014

    Those dogs don’t mess about.. Nature is not as pretty as most people think
    this is the reality,,, the hunters and the hunted….

    • BaadBoy's Playhouse
    • November 12, 2014

    This isn’t the first video I’ve seen with a wild dog/impala kill at
    this location so it must happen often. This is nature — natural
    environment with nobody intervening and I don’t have a problem with vids
    like this. It’s other videos with things like a farm animals thrown into a
    tiger compound or small animals dropped into a snake cage that are barbaric
    and have nothing to do with a natural occurrence in the wild. 

    • Elijah McCoy
    • November 12, 2014

    Lmao at the people who complain about these types of videos… Smh… These
    animals gotta eat too! They aren’t herbivores you dumbfucks! They need meat
    in order to survive otherwise they’ll die! Did you forget that our domestic
    dogs use to live like this too? Hell… some still do even! So stop
    bitching and moaning about every goddamn thing and quit being so fucking
    soft and grow a pair! Goddamn! If you don’t like it? Don’t watch! Plain and

    • SirChipperton
    • November 12, 2014

    Poor girl, just too tired to fight back anymore. That will go a good ways
    toward keeping the dogs fed. Also…’see how it circles around, you just
    don’t see that’, while most animals lack that kind of reasoning power, even
    my pet cats have that kind of pathing logic, so I think it’s safer to say
    it’s reserved for highly developed predators, rather than being some crazy
    rare trait of those dogs.

    • Jahon Gir
    • November 12, 2014

    Lions have better skills than any other animals

    • Mohamed Farouk
    • November 12, 2014

    Good that you didn’t film the eating process.

    • Olivia Arenas
    • November 12, 2014

    omg… i’m 30yrs old, an animal lover… my heart sank and i started
    sobbing when i saw them tear out the baby

    • Gilbert Stateresa
    • November 12, 2014

    If I was that impala, I definitely would of just stayed in water as long as
    I can and would rather drowned than get ripped apart like that, but it
    didn’t know any better. 

    • shawn Amed
    • November 12, 2014

    Wow yall just sat their and watched fuck you bitches this is really fucked
    up go to hell natgeo

    • Amin Momtaheni
    • November 12, 2014

    at least lions have some dignity to chock and kill the food before eating
    them. these dogs are just eating her alive. no wonder if they say you are
    eating like a dog, we consider as an insult. lol

    • humza raza
    • November 12, 2014

    Stupid impala just stay in the water fam

    • Brandon Smith
    • November 12, 2014

    that impala was stupid should stayed in the water 

    • humza raza
    • November 12, 2014

    That dog ripped it’s dick off…. ._.

    • Max Payne
    • November 12, 2014

    That impala so fuckin stupid it had more than enough time to run before the
    dogs came around fuckin idiot.

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