科学家研究发现鸽子脑内有与生俱来的空间图
<p><span word="The">The</span> <span word="mystery">mystery</span> <span word="of">of</span> <span word="how">how</span> <span word="a">a</span> <span word="pigeon">pigeon</span> <span word="can">can</span> <span word="always">always</span> <span word="find">find</span> <span word="its">its</span> <span word="way">way</span> <span word="back">back</span> <span word="home">home</span> <span word="has">has</span> <span word="finally">finally</span> <span word="been">been</span> <span word="solved">solved</span>.</p><p><span word="Scientists">Scientists</span> <span word="believe">believe</span> <span word="that">that</span> <span word="pigeons">pigeons</span> <span word="have">have</span> <span word="a">a</span> <span word="spatial">spatial</span> <span word="map">map</span> <span word="that">that</span> <span word="allows">allows</span> <span word="them">them</span> <span word="to">to</span> <span word="fly">fly</span> <span word="in">in</span> <span word="an">an</span> <span word="unfamiliar">unfamiliar</span> <span word="territory">territory</span> <span word="and">and</span> <span word="know">know</span> <span word="exactly">exactly</span> <span word="where">where</span> <span word="they">they</span> <span word="are">are</span> <span word="going">going</span>.</p><p><span word="The">The</span> <span word="finding">finding</span> <span word="replaces">replaces</span> <span word="the">the</span> <span word="current">current</span> <span word="theory">theory</span> <span word="that">that</span> <span word="pigeons">pigeons</span> <span word="compare">compare</span> <span word="the">the</span> <span word="coordinates">coordinates</span> <span word="of">of</span> <span word="their">their</span> <span word="location">location</span> <span word="with">with</span> <span word="those">those</span> <span word="of">of</span> <span word="the">the</span> <span word="home">home</span> <span word="loft">loft</span> <span word="and">and</span> <span word="then">then</span> <span word="systematically">systematically</span> <span word="reduce">reduce</span> <span word="the">the</span> <span word="difference">difference</span> <span word="between">between</span> <span word="the">the</span> <span word="two">two</span> <span word="to">to</span> <span word="find">find</span> <span word="their">their</span> <span word="way">way</span> <span word="home">home</span>.</p><p><span word="This">This</span> <span word="earlier">earlier</span> <span word="theory">theory</span> <span word="likens">likens</span> <span word="the">the</span> <span word="navigation">navigation</span> <span word="of">of</span> <span word="pigeons">pigeons</span> <span word="to">to</span> <span word="that">that</span> <span word="of">of</span> <span word="flying">flying</span> <span word="robots">robots</span>.</p><p><span word="But">But</span> <span word="experiments">experiments</span> <span word="carried">carried</span> <span word="out">out</span> <span word="at">at</span> <span word="the">the</span> <span word="University">University</span> <span word="of">of</span> <span word="Zurich">Zurich</span> <span word="have">have</span> <span word="shown">shown</span> <span word="that">that</span> <span word="pigeons">pigeons</span> <span word="possess">possess</span> <span word="cognitive">cognitive</span> <span word="capabilities">capabilities</span>.</p>
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