Most cats don’t react to pictures of cats. Usually. The image isn’t real enough for them, lacking three dimensions, smell, movement, or something else. But the cat in this video reacts to its portrait with caution and curiosity.
This might not be unique to animals. If people aren’t raised with pictures, they might not recognize them. I once read that some forest people in Africa did not recognize pictures of elephants because they don’t smell like elephants. But I don’t know if that is true.