Excluding the different color or texture of their skin/fur
In: Biology
Human faces look pretty darn similar overall, it’s just that you’ve got a lifetime’s worth of practice recognizing people and telling them apart, and we’ve also apparently got some structures in our brains pretty much entirely devoted to human face recognition. It’s a fair bet that many other animals’ visual systems are similarly optimized for recognizing/distinguishing others of their own species.
But it’s not entirely innate, there’s learning involved too. If you spend enough time with a lot of dogs or cats, you’ll start to see the variations in their facial features, and be able to them apart even if they have the same overall shape/size/markings/colorings.
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