By Daily Mail Reporte
Their numbers were devastated a year ago when severe storms hit their colonies.
But now the Monarch butterfly has made a spectacular comeback having more than DOUBLED in size this winter.
Despite the growth, however, the migrating insect remains under threat.
Millions of butterflies make a 2,000-mile journey each year from Canada to winter in central Mexico's warmer weather but the size of that migration can vary wildly.
Link to news site http://www.dailymail.co.uk/sciencetech/article-1357164/Reborn-The-Monarch-butterfly-makes-comeback-Mexico-year-storms-devastated-colonies.html