Vanessa cardui the HOSTS database. The main defense mechanisms of the painted lady butterflies include flight and camouflage. The caterpillars hide in small silk nests on top of leaves from main predators that include wasps, spiders, ants, and birds. "Vanessa cardui" and other painted lady butterflies are bred in schools for educational purposes and used for butterfly releases at hospices, memorial events and weddings. Vanessa cardui Vanessa cardui is a well-known colorful butterfly, known as the painted lady, or in North America as the cosmopolitan. "V. cardui" is one of the most widespread of all butterflies, found on every continent except Antarctica
Urophora cardui Urophora cardui Urophora cardui or the Canada thistle gall fly is a fruit fly which, contrary to its common name, is indigenous to Central Europe from the United Kingdom east to near the Crimea, and from Sweden south to the Mediterranean. The Canada thistle gall fly has been introduced to North America from Europe to control the population of its host plant, Canada, or creeping thistle, which is an invasive, introduced weed in North America. The fly starts life as an egg, about one to thirty of them, laid on the stems of its host plant, the Canada thistle, "Cirsium