How do monarch butterflies sense danger?

Monarch Butterflies sense danger primarily through their highly developed sensory organs, including compound eyes and antennae. Their compound eyes allow them to detect movement and changes in light, while their antennae help them sense chemicals in the environment, including pheromones from predators. Additionally, monarchs are known to rely on their bright coloration as a warning signal to potential threats, indicating their unpalatability due to the toxic compounds they accumulate from their host plants. This combination of sensory perception and warning coloration helps them evade predators effectively.