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	<title>markerless motion tracking &#8211; BIOENGINEER.ORG</title>
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		<title>Wild indri lemurs widen mouths as song pitch rises</title>
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		<pubDate>Mon, 26 Oct 2026 21:28:14 +0000</pubDate>
				<category><![CDATA[Biology]]></category>
		<category><![CDATA[animal communication]]></category>
		<category><![CDATA[convergent evolution]]></category>
		<category><![CDATA[indri lemur]]></category>
		<category><![CDATA[Lemur]]></category>
		<category><![CDATA[Madagascar]]></category>
		<category><![CDATA[markerless motion tracking]]></category>
		<category><![CDATA[mouth opening]]></category>
		<category><![CDATA[opera]]></category>
		<category><![CDATA[song pitch]]></category>
		<category><![CDATA[uses]]></category>
		<category><![CDATA[vocal-tract tuning]]></category>
		<category><![CDATA[wildlife bioacoustics]]></category>
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					<description><![CDATA[An observational analysis of 83 recordings of 19 wild indri lemurs found that mouth opening increased as song pitch rose, suggesting coordinated vocal-tract tuning.]]></description>
		
		
		
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