A hard, thorny or needle-like structure which occurs on various animals. Animals such as porcupines and sea urchins grow spines as a self-defense mechanism. Spines are often formed of keratin. Other animals with spines are hedgehogs, spiny mice and at least two ornithischian dinosaurs. [ http://en.wikipedia.org/wiki/Spine_(zoology) ]

This is just here as a test because I lose it

Term information



editor note

May be reclassified depending on CARO treatment of appendage

has related synonym

spiny appendage



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