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The ancient precursor to mammals, Dimetrodon, had extremely long spines on their backbone that were joined together with a web of skin to form a sail-like structure.
Spines are also found in invertebrate animals, such as sea urchins. They are a feature of the shell of a number of different species of gastropod and bivalve mollusks, including the venus clam Pitar lupanaria.
In many cases, spines are a defense mechanism that help protect the animal against potential predators. Because spines are sharp, they can puncture skin and inflict pain and damage which may cause the predator to avoid that species from that point on.
The spine of some animals are capable of injecting venom. In the case of some large species of stingray, a puncture with the barbed spine and the accompanying venom has occasionally been fatal to a human.
Animals such as porcupines are considered aposematic, because their spines warn predators that they are dangerous and potentially toxic (Speed, & Ruxton 2005). Porcupines rattle their quills as a warning to predators, much like rattlesnakes.
Treating injuries caused by spines 
Because many species of fish and invertebrates carry venom within their spines, a general rule of thumb is to treat every injury as if it were a snake bite. Venom can cause intense pain, and can sometimes result in death if left untreated.
On the other hand, being pricked by a porcupine quill is not dangerous, and the quills are not poisonous. The quill can be removed by gently but firmly pulling it out of the skin. The barbed tip sometimes breaks off, but it works its way out through the skin over time.
Human uses 
Common uses for animal spines include:
- Bracelets, earrings, and necklaces made from these spines are very common
- Tribes from around the world use porcupine quills as jewelry for their body modification i.e. through the nose
- Some of the earliest pens were made from quills
- Brush, Paintbrush
- Speed, M. P.; Ruxton, G. D. (2005). "Warning displays in spiny animals: One (more) evolutionary route to aposematism". Evolution; international journal of organic evolution 59 (12): 2499–2508. PMID 16526498.
- "Wilderness Survival". Dangerous Fish and Mollusks. retrieved 2012-03-20
- Conger, Cristen. "What's the best way to remove porcupine quills?". http://animals.howstuffworks.com/mammals/remove-porcupine-quills1.htm . retrieved 2012-03-20
- Highland, James. Porcupine Quill Uses.http://www.ehow.co.uk/list_6178270_porcupine-quill-uses.html retrieved 2012-03-27
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