The animal name is correctly spelled echidna, the "spiny anteater".
(The name is from the half-snake woman in Greek mythology, capitalized Echidna.)
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An Echidna is a monstrous snake women with a human head and a
snake-like body. It has a forked-tongue, vicious fangs, scaly skin
and the eyes of a reptile.
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Now, it is the head of monsters, Echidna, and her son,
Chimera.
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He is the offspring of Echidna and Typhon.
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Well in Greek Mythology and the Lightning Thief the mother of
monsters is Echidna.