Guard kitty

My two kitties like to sometimes lounge on the back of the love seat. Not typically this close. They have a good view of the french doors.

The more feisty one will start growling when she sees movement or hears noise out there, haha! It's so cute to me. Grrrawr. 😼🥹

Last thing was a deer strolling by. As I always check.
Do your cats ever do this?