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As recently as the early 1990s, many scientists considered most North American azures as a single species (Celastrina ladon). More recently, however, research has revealed that there are, in fact, many different species of azures. One of the more common spring butterflies in the East, the holly azure (Celastrina idella) was not even recognized and named until 1999. These butterflies are quite tolerant of cold. They often appear early in the spring, when nights still dip below freezing. Amazingly, adults can even survive being buried in a few inches of snow.