I saw another stray kitten earlier and I was wondering how my two kittens Orange and Gray would react when they see another kitty probably a week younger. To my surprise, they were were kinda angry and afraid at the same time with the stranger kitty as they make growling noises. Then the mother of the Orange and Gray seemed to smell the new kitty in the block and was acting strange but she didn't actually see her ( I think) but then when Orange approach her mother, the mother delivered rapid jabs and cat fists right at Orange and started hissing at her, it seemed that the mother had mistaken Orange for the new cat. I was thinking maybe they recognize other cats with their smell first rather than by face and probably the same with humans too?