How do we really know that animals express and feel emotions?
In: Biology
from the way they interact and react to their enviroment. By looking at how an animal reacts to its surroundings over time you are able to deduce what emotions arise.
If you mean literally how do humans detect emotions in different species: humans are hard wired to be extremely sensitive to changes in mood and expression due to how we evolved. we are sensitive enough that we can detect these changes in other creatures once familiar with their habits.
if you looked up a random photo of a person on google right now you would be able to look at them amd have a basic idea of their feelings at that moment. as a cat person i can tell you i could probably do the same with a cat picture.
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