Why do kittens sometimes get poofy and hiss when they meet a strange cat? I could understand those scaring off members of other species but fellow cats? https://www.youtube.com/watch?v=IJXMFr5lf80; https://www.youtube.com/watch?v=mnVLjKRCO4I

I am age 57, mentally disabled just looking to answer and ask questions, I live on the East Coast of the United States of America I try to give positive advice and keep things for real and I expect the same treatment in return have a Blessed day hope God Blesses your day with the best of health, happiness, Many Blessings.