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Tens of millions of snout butterflies -- scientifically known as Libytheana bachmanii larvata -- have swarmed into South Texas. The snout butterflies have ended up breeding in record profusion in the area. The snout butterflies are rather small, dull colored and have an appendage that allows themselves to attach to branches and look rather like leaves. There is concern that the snout butterflies may end up denuding hackberry trees in Texas. Experts maintain that the population explosion is the result of the drought in the region. The butterflies have thrived in the absence of many of their enemies who have not survived the drought. Generally, there is a 99 percent mortality rate among insects from the egg to adult stage. Even a minor adjustment in these odds can result in a tremendous population explosion. It is not clear why these butterflies are grouping and massing as they have been. Butterflies are not social creatures by nature and do not normally fly in flocks like birds ... and like the snout butterflies have been doing in Texas.