Spine (zoology)

In a zoological context, spines are hard, needle-like anatomical structures found in both vertebrate and invertebrate species. The spines of most spiny mammals are modified hairs, with a spongy center covered in a thick, hard layer of keratin and a sharp, sometimes barbed tip.

This article is about needle-like growths in animals. For backbone, see Vertebral column. For other uses, see Spine (disambiguation).
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