Every winter, a marvelous spectacle occurs as hundreds of thousands of butterflies travel south across Taiwan in one of the world’s most rare migrations.

We know about migrating species of butterflies, but they don't all fly south for the winter. Several overwinter in their home habitat and could use your help.

Butterflies have long been believed to represent transformation and change, thanks to the stunning metamorphosis they must go through to go from caterpillar to the winged pollinator so many of us ...