Why do bees and wasps share black-and-yellow warning coloration?

Bees and wasps share black-and-yellow warning coloration as a form of aposematism, a biological strategy where dangerous or noxious organisms advertise their defensive capabilities—such as stings or poisons—to potential predators.12

This shared appearance is a classic example of Müllerian mimicry, a phenomenon where multiple unrelated, dangerous species evolve to exhibit similar warning signals. By adopting the same black-and-yellow pattern, these insects simplify the learning process for predators. Once a predator has a negative experience with one of these species, it learns to generalize the warning signal and avoid all similar-looking organisms.345

This mechanism is highly advantageous for the insects because it reduces the number of individuals that must be "sampled" or attacked by predators for the warning to be effective, thereby minimizing the risk of injury to the prey.46