Season 3 begins! In this themeless episode, Aaron kicks things off with the population of wallabies living on Scotland's Inchconnachan Island. Learn about the history of their arrival, their impact on the native wildlife, and the natural history of competition between marsupial and placental mammals. Rustin follows with a new hot topic...Cocaine sharks. Learn how Rustin explains the sensationalism behind this incident, including how Cocaine ends up in waterways and the implications of using aquatic wildlife to study drug usage.

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