The Trump administration is reopening public comment on a proposed rule that would list the monarch butterfly as threatened under the Endangered Species Act.

The monarch butterfly's annual migratory journey from Canada to Mexico is a breeze compared to the federal government's lengthy process to protect the dwindling species. Why it matters: The monarch — whose population has declined more than 80% since the 1990s — has waited more than 10 years for protection under the Endangered Species Act.