Assertion: fire ant's queen | /r/HasProperty | estimated 9 to 20 unrelated
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Source sentences:
text: Arriving with an estimated 9 to 20 unrelated queens, the red imported fire ant was only rare at the time, as entomologists were unable to collect any specimens (with the earliest observations first made in 1942, preceded by a population expansion in 1937); the population of these ants exploded by the 1950s.