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Fuzzy fur
Flashing claws
Biting teeth
Flicking tail
Meowing
Cat behavior is mostly silent. Cat posture and movements are subtle and can communicate calm, alert or threat. Aggressive behavior is a self defense response to a perceived threat. People can project threatening behavior because we might stare, loom over and grab or pet abruptly. Cats in general don’t like loud noises and sudden or erratic movements.
In the wild, correct responses to the environment means life or death. It means eating or starving. Living or dying.
Trust between individuals takes time. Moderating responses to threats takes practice. Frankie, short for Frankenstein is appropriate as a name. At once gentle quietness can flip instantly to flight or fight.