Assertion: pigeon's population | /r/CapableOf | go through a period of rapid expansion
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text: A 2017 study of passenger-pigeon DNA found that the passenger-pigeon population size had been stable for 20,000 years prior to its 19th-century decline and subsequent extinction, while a 2016 study of ancient Native-American DNA found that the Native-American population went through a period of rapid expansion, increasing 60-fold, starting about 13–16 thousand years ago.