Do bulls hate the color red?

• Cattle can distinguish long-wavelength stimuli associated with red from some blue or green stimuli.
• A peer-reviewed study found stronger calf movement under long-wavelength light in some tests.
• A review reports behavioral differences involving red-colored electric-fence tape.

• Cattle have two cone mechanisms, indicating dichromatic rather than human-like color vision.
• Ohio State guidance states that cattle target a cape’s movement, not its red color.
• The behavioral studies measured movement or avoidance, not rage or a bull-specific red aggression response.

Red or long-wavelength stimuli may influence some cattle behaviors under particular conditions, but the evidence does not support the claim that bulls are enraged by red. Movement and situational threat better explain charging at a bullfighting cape.