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Fleas were animals native to Earth commonly found on dogs, (TV: The Two Doctors) and in "a beggar's robes". (TV: The Masque of Mandragora) According to the Eleventh Doctor, even educated fleas "do it". (TV: Hide)

Behind the scenes Edit

This is a reference to Ella Fitzgerald's "Let's Do it, Let's Fall in Love":

Birds do it, bees do it. Even educated fleas do it. Let's do it. Let's fall in love.

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