Assertion: humpback whale's call | /r/HasProperty | estimated by monnahan et al
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text: It was previously thought that blue whales in the North Pacific belonged to at least five separate populations; however, evidence from movement data derived from satellite tags, photograph-identification, and acoustic data supports two populations in the North Pacific—the Eastern and Central and Western North Pacific populations, with divisions according to acoustic calls being estimated by Monnahan et al.