A Brief History of Dogs
nationalgeographic.org
A Brief History of Dogs
As humankind's oldest companion, dogs have been by our side for thousands of years. See how deeply our histories connect and learn how these lovable canines evolved from formidable carnivores to loyal protectors and members of the family.
2023年10月19日
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Some other fun doggy vision facts: 👉 Dogs have worse visual acuity than humans: the ability to clearly make out all the details of an object (four to eight time worse than humans). This is due to to the different neural structures of the dogs' eyes, especially the fewer connections of the rods to the ganglion cells and the smaller number of optic nerve fibres 👉 Dogs see brightness differences roughly half as well as humans 👉 Dogs focus on faces of other dogs, but not really the faces of human
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Some other fun doggy vision facts: 👉 Dogs have worse visual acuity than humans:
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