I would imagine these would be awesome for birds. They are called Havalon Knives. They worked like razor blades (havalon are basically surgical scalpels that are a little thicker than razors)
This is why we started carrying them, it might not be something you are interested in but they are fair priced, blades are cheap for as long as they can be used and it is really nice not to be able to not have to spend a whole night sharpening it. Needless to say, i replaced my heavy knife with one of the new lightweight havalon.
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http://www.bugsnbullets.com/Havalon_...g_mid_102.html