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11 intriguing transparent animals

By: Bryan Nelson on Jan. 24, 2011, 11 a.m.
Glasswing butterfly

Photo: zingyyellow/Flickr

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Glasswing butterfly

This butterfly with transparent wings has a Spanish name, "espejitos," which means "little mirrors." If it wasn't for the opaque outline around the wings, the average observer might not see one perched on a leaf or flower.

Adult glasswing butterflies will often migrate great distances, and males of the species are known to lek, or gather in large groups for the purpose of competitive mating displays.