A cat's pupils will change according to the brightness of the surrounding light source. This is a method for cats to control the light source entering the bottom of their eyes by adjusting their pupils, allowing cats to better adapt to changes in the environment. Even if the surrounding light does not change, the size of the cat's pupils will change depending on the mood of the cat. The reason is that emotions change the adrenaline in the cat's body, which affects the size of the pupil.

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When a cat is in a bad mood or is in an aggressive state, it will stare sharply at its opponent and its pupils will become thinner; when a cat is scared and surprised, its emotions In a state of extreme excitement, the pupils will dilate.