Echidna flea
Encyclopedia
The echidna flea is thought to be the world's largest flea
Flea
Flea is the common name for insects of the order Siphonaptera which are wingless insects with mouthparts adapted for piercing skin and sucking blood...

 and it parasitises the short-beaked echidna
Short-beaked Echidna
The short-beaked echidna , also known as the spiny anteater because of its diet of ants and termites, is one of four living species of echidna and the only member of the genus Tachyglossus...

. It reaches 4 millimetres in length.
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