Tail Signals.

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Tail Signals
Tail Held Erect - Stop
Tail Rippling - Move Forward Slowly
Tail Held Erect and Sweeping Slowly from Side to Side - Retreat Silently
Tail Pointing Low, Parallel to the Ground and Sweeping - Spread Out
Tail Flattened - Get Down
Tail Bobbing - Enemy Sighted
Tail Hooked - Danger
Tail Pointed Sharply - Go That Way
Tail Held Erect and Waving from Side to Side - Stay Behind Me
Tail Kinked over Back - Follow Me
Tail Flicking over Back - Leave, but Be Careful
Tail Tip Facing Other Way - Attack

Tail Flicks
A tail flick can be used in many ways. It can mean, "Follow me", "I heard you", or even, "Shut up, mouse brain!" Here are some different situations:
-- A bristle and a sharp flick of your tail usually means, "Get over here now! I'm angry with you!"
-- A flick and jerking your head in a certain direction means, "Meet me to the bushes at your left" or "Sneak out of camp with me through the brambles to the right."
-- If you call out to someone and their back is to you, they can flick their tail to show that they've heard.
-- Sticking your tail straight up in the air and flicking it sharply down means, "Sit!"
-- An eye-roll and a flick of the tail means, "Whatever."
-- A mrrow of laughter and a flick of a tail means, "That was a good joke."
-- Saying, "Oh, fox-dung, I gotta go!" and flicking your tail means, "Sorry! Talk to you later?" or "Yikes! I've gotta go use the dirtpile!"
-- Flicking your tail at a she-cat's belly and smiling means, "She's expecting kits!"
-- Flicking your tail at someone and making a face means, "What is wrong with him/her?"
-- A sharp flick of your tail during battle can mean two things; it can mean, "Attack!" or it can also mean, "Help me!"
-- A shrug and a tail flick means, "Oh well."
-- Putting a tail over another cat's mouth means "Shut up, mouse-brain!" when the tail is sharp or "Please, quiet" when the cat is talking too much.