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Monarch butterfly numbers dwindling at California sanctuary

Brian Hackney reports on the dwindling population of monarch butterflies. Website: http://kpix.com/ YouTube: http://www.youtube.com/CBSSanFrancisco Facebook: https://www.facebook.com/CBSSanFrancisco Instagram: https://www.instagram.com/kpixtv/ Twitter: https://twitter.com/KPIXtv
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