Photos by @FransLanting When a rare snowstorm hit the mountains in Mexico where Monarch butterflies had gathered for the winter, millions of them lost their grip and were knocked down to the ground. The entire forest floor was covered in lifeless butterflies, but after the storm passed and temperatures rose, many of them miraculously came back to life. They raised their body temperature by quivering their wings as you can see in these photos. After a while millions of trembling Monarchs were able to slowly crawl up tree trunks with wings spread like solar panels to soak up heat so they could get back to their favorite roosting spots high off the ground. It was an amazing sight, but it also confirmed how vulnerable they are—to weather and to gaps in the forest caused by illegal logging which disturbs the microclimate they need to hibernate. Go to @FransLanting to see more images of this remarkable phenomenon. @ChristineEckstrom @ThePhotoSociety @NatGeoCreative @XercesSociety #Butterfly #Monarch #Endangered #CenterforBiodiv #Monarch_Watch #Migration