Dogs are best known for love and loyalty, but they also have some little-known (and very fascinating) characteristics. Here are 8 incredible scientific discoveries about them:
8. Dogs have three eyelids.
While you can see the upper and lower lids, the third eyelid only appears when there's issues with the eye. That's when you'll see that reddish or pink membrane emerge and start covering the eye. Formally known as the nictitating membrane, a dog's third eyelid serves as eye protection.
7. Evidence shows that dogs really love you
Our evidence comes from neuroscientist Gregory Berns, who scans dog brains. His team showed, in a small 2014 study, that the canine brain lights up differently when a dog sniffs its owner. They trained a handful of dogs to sit still in an fMRI machine to monitor a part of their brain called the caudate nucleus, which helps coordinate our neural 'reward system'.
6.Dogs as Smart as 2-year-old Kids
The canine IQ test results are in: Even the average dog has the mental abilities of a 2-year-old child. The finding is based on a language development test, revealing average dogs can learn 165 words (similar to a 2-year-old child), including signals and gestures, and dogs in the top 20 percent in intelligence can learn 250 words.
5. Dogs have a better night version than human
Dogs see a lot better than humans do at night. Dogs have many adaptations for low-light vision. A larger pupil lets in more light. The center of the retina has more of the light-sensitive cells (rods), which work better in dim light than the color-detecting cones.
4. Every nose is unique
Like human fingerprints, each dog's nose is completely unique to each pup. No two dog noses are alike. ... These patterns can even be used to identify one dog from another. Nose printing is the most reliable form of dog tracking because a dog's nose never changes.
3. Dog dreams, too
Many scientists say there is evidence to support the idea that dogs do, in fact, experience dreams. Researchers using an electroencephalogram (EEG) have tested canine brain wave activity during sleep. They've found that dogs are similar to humans when it comes to sleep patterns and brain wave activity. Like humans, dogs enter a deep sleep stage during which their breathing becomes more irregular and they have rapid eye movements (REM). It is during REM sleep that actual dreaming and, often, involuntary movements take place. Dogs may move their legs as if they are running, whine or whimper as if excited, and breathe rapidly or hold their breath for short periods.
2.Fur isn't just about warmth.
A healthy coat helps keep a pet's temperature properly regulated by providing an insulating layer of fur. A healthy coat can efficiently regulate body temperature by moving hair follicles to bring hairs closer together to insulate or allow air to enter under looser hairs to cool a dog or cat.
1.Dogs don't sweat like humans
Dogs lack the normal, predominant sweat glands thathumans and other species have. While dogs have a small amount of sweat glands (which are prominently in the paw pads), their primary source of heat exchange (i.e., getting rid of heat) is by panting.
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