Definition of echidna
: a spiny-coated toothless burrowing nocturnal monotreme mammal (Tachyglossus aculeatus) of Australia, Tasmania, and New Guinea that has a long extensible tongue and long heavy claws and that feeds chiefly on ants; also : a related mammal (Zaglossus bruijni) of New Guinea having a longer snout and shorter spines
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There are two species of echidna. Both are egg-laying mammals that are stocky and virtually tailless. They have strong-clawed feet and spines on the upper part of a brownish body. The snout is narrow and the mouth is small, with a tongue that is long and sticky for feeding on termites and ants, their chief food. New Guinea echidnas are 18–31 in (45–78 cm) long and piglike. Valued for their meat, they are declining in numbers. Echidnas of Australia and Tasmania are 14–21 in (35–53 cm) long. Echidnas exude milk from mammary openings on the skin, and the young lap it up.
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Origin and Etymology of echidna
New Latin, from Latin, viper, from Greek — more at ophitic
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Britannica.com: Encyclopedia article about echidna
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