Assertion: starling's number | /r/CapableOf | grow into the 100's of millions
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text: Having no natural enemies and now, with all the new and unlimited opportunities to nest, they propagated and flourished and from that time until today, this species has spread out across the U.S. Starlings are cavity nesting birds and because they have propagated unchecked for all these years, their numbers have grown into the 100's of millions and they are now a very big problem in this country, especially in the cities.