It's not likely they will run out of new butterflies to discover. Check out these statistics, courtesy of www.naba.org
"How many kinds of butterflies are there?
"There are approximately 20,000 species of butterflies in the world. About 725 species have occurred in North American north of Mexico, with about 575 of these occurring regularly in the lower 48 states of the United States, and with about 275 species occurring regularly in Canada. Roughly 2000 species are found in Mexico."
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