https://theheartthrills.com/2026/09/04/extinction-is-forever/the heart thrillsen2026-09-04T09:21:21+00:00EXTINCTION IS FOREVERCalifornia, Monarch butterfly, Monarch butterfly migration, oyamel fir tree, Central Mexico, overwintering sites, tropical milkweed, common milkweed, green antelope horn milkweed, antelope horn milkweed