Cat behavior Wikipedia What it means if you cat's tail shakes like this YouTube Why Do Cats Vibrate Their Tails? Reading Your Cat's Body Language Kinship Why Does My Cat's Tail Twitch? 6 Vet Reviewed Reasons Catster You asked and we picked one question to answer this week: "Why does my cat shake her tail like a rattlesnake?", We've got the answer below from behavior professional Kenzie Korpela, IAABC SBA, CFVA.