Animal survival relies on environmental information gathered by their sensory systems. We found that contrast information of a looming stimulus biases the type of defensive behavior that goldfish (Carassius auratus) perform. Low-contrast looms only evoke subtle alarm reactions whose probability is independent of contrast. https://www.diegojavierfares.com/super-price-Beloit-Sky-Carp-OC-Adjustable-White-Home-Hat-p19606-mega-choice/