A monarch butterfly tagged by conservation researchers in Winnipeg has reached Mexico after travelling approximately 2,300 kilometres over 40 days, providing an important milestone in a research project designed to better understand the long-distance migration of the species. The butterfly, identified by its tracking code MB26011, crossed into northern Mexico on October 5. It is the first of 29 monarch butterflies tagged in Winnipeg this year to be confirmed in Mexico. Researchers say its journey demonstrates the extraordinary endurance of these delicate insects as they travel thousands of kilometres to reach their winter habitat. The initiative is a collaboration involving the Assiniboine Park Zoo, Environment and Climate Change Canada and the Living Prairie Museum. The butterflies were tagged on August 26 and 27 as part of a wider effort to study monarch migration across North America. The Manitoba project is particularly significant because it represents the first time monarch migration has been tracked using this technology in the province and the first tagging initiative of its kind in Western Canada. Laura Burns, conservation programs manager at the Assiniboine Park Zoo, described the butterfly’s progress as remarkable. Although it has already crossed a substantial distance, it still has approximately 800 kilometres to travel before reaching its traditional overwintering grounds in central Mexico. The tracking devices attached to the butterflies weigh just 0.06 grams and use tiny solar panels to power their signals. They can be detected by compatible tracking stations and other receiving devices, allowing researchers to follow the insects’ movements across large areas. The technology helps scientists gather information about migration routes and movements that would otherwise be extremely difficult to observe. More than 1,300 monarch butterflies have been tagged across North America during the current migration season. Researchers are monitoring the Winnipeg group to determine how many will reach Mexico and which routes they will follow. Some of the Manitoba-tagged butterflies were still being detected in U.S. states such as Kansas, Missouri, Oklahoma and Texas, while others had stopped transmitting signals. The migration is one of the most extraordinary journeys undertaken by an insect. Monarchs travelling from Canada and the northern United States head south as temperatures fall and the availability of suitable food changes. Many eventually gather in the mountain forests of central Mexico, where they spend the winter in large colonies before the next stage of their life cycle begins. The journey is fraught with risks. Butterflies must navigate changing weather conditions, strong winds, urban areas, roads, agricultural fields and natural predators. They also need sufficient energy reserves to continue flying and must find suitable places to feed and rest along the way. Researchers say favourable winds and weather can make a considerable difference to whether individual butterflies complete the migration. The tracking project is expected to help scientists identify important migration corridors and stopover locations. By understanding where butterflies travel and where they encounter obstacles, conservation organizations may be able to focus habitat protection and restoration efforts on areas that are especially important for their survival. Monarch butterflies face several conservation challenges, including habitat destruction, pesticide exposure and declining availability of milkweed. The plant is essential to the species because monarch caterpillars feed on its leaves. The loss of milkweed and flowering plants can affect both breeding success and the ability of adult butterflies to build up the energy needed for migration. In Canada, monarch butterflies are listed as an endangered species under the federal Species at Risk Act. Scientists and conservation groups have been working to improve habitat and understand the factors contributing to population declines. Tracking individual butterflies offers another way to investigate their needs throughout their annual journey. Researchers caution that the arrival of one butterfly does not mean the wider migration is free from danger. The remaining tagged insects will continue to be monitored, and their movements may reveal important differences in the routes they take and the challenges they face. The successful journey of MB26011 offers an encouraging early result for the Winnipeg research team. Scientists hope that the information collected through the project will strengthen conservation efforts across Canada, the United States and Mexico, helping protect the habitats that monarch butterflies depend on throughout their remarkable annual migration.