Assertion: humpback whale's population | /r/HasProperty | extirpated
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Source sentences:
text: In recent years, there have been 374 sightings of blue whale schools east of 157°E and north of 35°N off Japan, with abundance estimates of 38 to 958 during the years of 2008–2014, but it is not clear if these are sightings of the population considered to be extirpated or an expansion westwards of the western and central North Pacific population.