Spine (zoology)
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This article is about needle-like growths in animals. For backbone, see Vertebral column. For other uses, see spine.
A spine is a hard, thorny or needle-like structure which occurs on various animals. Animals such as hedgehogs, porcupines and sea urchins grow spines as a self-defense mechanism. Spines are often formed of keratin. Other animals with spines are hedgehogs and spiny mice
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