The monarch was placed on a waitlist until last December, when the agency formally proposed the butterfly's Endangered Species Act listing and unveiled a list of recommended conservation efforts. This began the initial public comment period, which ended March 12.

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

Experts share with us how we can use milkweed plants, any variety, to attract Monarch Butterflies, which in turn will help grow the declining population.