Monarch butterflies begin their migration to Mexico from southern Canada and the eastern United States in late August. Many of the 100 million travelers will not complete the 3,000-mile journey, but their descendants will. Females lay eggs along the route, then die. The eggs hatch into the larval stage, then through all stages, till the new butterflies emerges. It may take several generations to reach Mexico and several to make it back to Canada, where the cycle begins again. In mid-September the monarchs pass through North Carolina. The best areas to view them are along the beaches and the gaps along the Blue Ridge Parkway and other mountain roads.