Shark Week returns: Shedd Aquarium expert discusses apex predator's role in ocean ecosystems

It is Shark Week! We know they are one of the apex predators of the ocean and they scare the heck out of humans, but they’re also extremely important in helping to maintain healthy ocean ecosystems! Kerri Olzewski from the Shedd Aquarium joined Good Day Chicago on Friday to teach us all about the fascinating creatures.

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