A
spine is a rigid, pointed surface protrubance, sometimes used to provide a defensive mechanism against attack. For example, the quills of a
porcupine, the needles of a
cactus, or the thorns of a
shrub. They can contain
poisons, some of which can cause
paralysis.
All Wikipedia text
is available under the
terms of the GNU Free Documentation License
Log
In /
Create
Account
