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Sightings of toxic hammerhead flatworms on the rise in Canada

Reported sightings of giant, toxic, invasive hammerhead flatworms are on the rise in parts of southeastern Canada. Experts say the worms can grow up to 3 feet long and pose a risk to children, pets and other small animals. Peter Ducey, PH.D. and distinguished teaching professor at SUNY Cortland, joins CBS News to discuss the worm.
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