The Junonia coenia (also known as the "Common Buckeye" butterfly) can be found in most areas of the United States. On March 8, 2006, the Postal Service released the 24-cent Common Buckeye Butterfly stamp. The stamp easily served two purposes for prepayment of postage. The first purpose paid the domestic postcard rate; the second purpose provided the additional postage for each ounce after the first ounce of a letter sent by first-class mail. Each of these roles for the Common Buckeye Butterfly stamp was made possible by postage rate increases that went into effect two months before the stamp's release.