The monarch butterfly is the most familiar butterfly in North America.
It is a milkweed butterfly and is beginning to spread into countries
that are now using milkweed as an ornamental plant. Much like many
birds, they migrate seasonally in huge swarms that are truly amazing.
Groups of butterflies don't come in herds or flocks, but in glimmers, swarms, flutters, rabbles, or kaleidoscopes. Just choose your favorite and go with that one. The butterfly was first named in 1758 and may have been so named for King William III of England.
Image via Green Renaissance