Sightings of toxic hammerhead flatworms are on the rise in Canada

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