An alternative spelling or misspelling of Echidna, a spiny egg-laying mammal native to Australia and nearby regions.
From Greek 'echidna' (viper, serpent, or porcupine), referring to the spiky-haired appearance of the modern animal; likely related to 'echis' (viper).
Echidnas are one of only five species of monotremes (egg-laying mammals) on Earth—they're living time capsules showing us what early mammalian evolution looked like, and they have venomous spurs like ancient mammals!
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