Episode 4
Season 4Episode 445 minoct. 31, 2019

Paul Martin investigates an invasive aquatic plant that is clogging up waterways and putting wildlife at risk, and Keeley Donovan visits Gloucester's Woodchester Mansion, home to the largest roost of endangered bats in the country.
Episode 4 has aired on oct. 31, 2019 at 09:15
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