Scientists now consider the migrating monarch butterfly to be endangered. The population of the beloved orange-and-black insect has dropped quickly in recent years. The International Union for the Conservation of Nature (IUCN) added the migrating monarch to its “red list” of threatened organisms. They said it is endangered. That means it is two steps from being extinct. When a species is extinct, there are no more living members. Stuart Pimm is an ecologist at Duke University in North Carolina. He was not involved in the new listing. He said, “It’s just a devastating decline. This is one of the most recognizable butterflies in the world.” IUCN estimates that the population of monarch butterflies in North America has fallen between 22 percent and 72 percent over 10 years, depending on the measurement method.