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4kO65 TIL that there are at least 5 species of shark living in the Thames estuary (which runs through London), and that one of those species is venomous.
kONNm TIL that in 1939 the London zoo killed all it's venomous animals to avoid releasing dangerous animals into the city in the event that the zoo was bombed.
kOpyg TIL At theoutbreak of the Second World War, zookeepers killed all the poisonous insects and snakes in London Zoo, in case it was bombed and they escaped