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Dogs' eyes, like those of most other mammals, contain just two kinds of cones. These enable their brains to distinguish blue from yellow, but not red from green. However, dogs do outperform humans in some visual abilities. Dogs are much
more sensitive to motion at a distance — anywhere from 10 to 20 times more sensitive than humans. Their vision is also well-suited to hunting during dawn and dusk.
It is often assumed that the ratio of the radius of the circle to the side length of the square (= the height of a man) in the “Vitruvian Man”, which is said to be drawn
by Leonardo da Vinci, is given by the golden ratio.Under my observation, my dog, Jimmy, fits the ratio that Leonardo da Vinci drew on Human’s body.
A dog’s sense of smell is about 1,000 to 10,000,000 times more sensitive than a human’s (depending on the breed). Ever wonder why your dog's nose is wet? The mucus on a dog's nose actually helps it smell by capturing scent particles. When a dog’s nose is dry they may lick it to aid them in scent.
Dogs move their ears to hear better, but also to express emotions. The posture/position of a dog’s ears at any given time tells the story of how they’re feeling.
Dogs pant and let their tongues hang out of their mouth to regulate their body temperature, because they have fewer sweat glands than humans.
Dogs’ ears move independently of one another. They can tilt, turn, raise, and lower their ears. Scientists generally contend dogs hear about four times better than we do.