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National Cat Day: 8 weird things cats do and why Kittens (Credit: MLADEN ANTONOV/AFP via Getty Images) (NEXSTAR) — Cats sometimes behave in strange ways, at least in the eyes of humans. But to cats, presumably, it’s perfectly natural and sane. Thursday is National Cat Day, and we thought we’d shed a little light on our feline friends. Hat tip to the ASPCA, which scratched together a  similar list  that helped us during our research. Here are eight weird things cats do and the reasons behind them. Rubbing and headbutting When cats use their heads to rub you or bop you, they are declaring that you belong to them. Cats release pheromones from their cheek areas that mark you as theirs. (Credit: STR/AFP via Getty Images) Kneading Cats like to press their paws back and forth into you, and the reason may go back to their kitten days when they would press on their mother’s tummy to stimulate milk flow. When your adult cat does this, he might be showing he’s relaxed and content. Ignoring you Ca