Scientists examine effect of wolves' absence and see an ecosystem 'unraveling'

No trace remains of the wolves whose howls ricocheted for millennia down the lush valleys of the Olympic Peninsula. Settlers and trappers killed them all in little more than three decades.

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<p><a href="http://www.physorg.com/news152463800.html">Scientists examine effect of wolves' absence and see an ecosystem 'unraveling'</a></p> <p>No trace remains of the wolves whose howls ricocheted for millennia down the lush valleys of the Olympic Peninsula. Settlers and trappers killed them all in little more than three decades.</p>