The barb, or spine, according to Dr. Shipp, can grow back if broken off, and is actually a modified scale, armored with recurved serrations that are as sharp as razors.
http://www.jerrylabella.com/stingray.html
ah, Google... =P
16 posted on 09/08/2006 10:26:00 PM PDT by Zeppelin
(You've been Zarqed !)