It is a well-known fact that most insects stay put, but the monarch butterfly is different

Original Toronto Star caption: It is a well-known fact that most insects stay put; but the monarch butterfly is different. Its flight to the south in the fal and return in the spring make it the most celebrated of North America's insect travellers. Below; a monarch caterpillar attaches itself to a leaf; drops its skin (seen on lower leaf); and enters the pupa stage.