Input (grade 9): The Echidna's fur may be infested with what is said to be the world's largest flea, Bradiopsylla echidnae, which is about 4 m long.
Output (grade 9): The Echidna's fur may be infested with what is said to be the world's largest flea, Bradiopsylla echidnae, which is about 4 mm long.