Mimicry in animals is a common form of protection from predators. For instance, two distasteful or toxic butterflies may mimic each other for mutual defense, as the viceroy and monarch butterflies do.

Last week, retired biology professor Jack Kirkley helped us tell the difference between the monarch and viceroy butterflies. The viceroy mimics the monarch, which is poisonous to eat. Following a ...

How does mimicry affect the way we judge other people? Whose behavior do we imitate, and in what situations? It turns out that we are more likely to mimic people who express joy, and we perceive those ...