Imagine a world without the delicate flutter of butterfly wings or the vibrant ... Milkweed is the sole host plant for monarch butterflies, meaning monarch caterpillars rely on it for survival.

After Hurricane Andrew ripped through South Florida in 1992, the already-scarce Miami blue butterfly almost went extinct: No one recorded a single sighting for years. Finally, in 1999, a cheer went up ...

The monarch butterfly population has declined in recent ... with the exception of the last generation of the year (meaning butterflies that complete the life cycle and survive to see winter ...

The endangered Karner blue butterfly has struggled with habitat loss. U.S. Fish and Wildlife Service ...