Dogs and Their People
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Our lives are entangled with those of other species, but we could disentangle if we wanted. With dogs, things are different. Our world and their world swirled together long ago like two different shades of paint. But why is that?
That underwater deal is entirely transactional; love plays no part. Humans and dogs, by contrast, adore each other. The relationship began—well, nobody knows exactly when it began. The earliest remains of humans and dogs interred together date to 14, years ago, but there are some unconfirmed finds that are said to be more than twice as old.
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The larger point is the meaning of the discoveries: we lived with dogs and then chose to be buried with them. Imagine that. It was only by the tiniest bit of genetic chance that our cross-species union was forged at all. Dogs and wolves share But elsewhere in the genome, there are a few genetic scraps that make a powerful difference.
On chromosome six in particular, investigators have found three genes that code for hyper-sociability—and they are in the same spot as similar genes linked to similar sweetness in humans.
When humans ourselves left the state of nature, our alliance with dogs might well have been dissolved. Never mind, though; by then we were smitten. Aristocrats took to including the family dog in family portraits.
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Wealthy eccentrics took to including dogs in their wills. There are about million of them worldwide, just shy of 80 million of whom live in the U. The single species that is the domestic dog— Canis lupus familiaris —has been subdivided into hundreds of breeds, selected for size or temperament or color or cuteness.
The experiment was designed to see whether dogs can evaluate humans interacting with one another over an object. The result showed most dogs avoided taking food from someone they had seen behaving negatively to, which in this case means ignoring, their master.
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View image of Credit: MachineHeadz. During the test, dogs watched their owners try to retrieve a roll of tape from a sealed, transparent container, and then turn to an actor sitting next to them to request help. For each scenario, a neutral person sat on the other side of the owner, and did not interact in the activity.
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Immediately afterwards, the actor and neutral person offered the dog food. However the dogs did not take food more often from the "helper" compared with the "control" actor or neutral person. View image of Credit: Brand New Images. Few non-primate animals are thought to eavesdrop.
source site Humans are the most prolific social eavesdroppers. We often help one another for no obvious benefit.
In humans, this sensitivity to interactions between others begins very early. Six-month-old babies can evaluate others based on their social behaviour, one study has suggested, showing preference to "helpful" over "nasty" characters.