[Mediawiki-l] Captcha for Creating Account?

[Eric K]

All (or most) Wikipedia sites have a Captcha at the time of creating accounts. That prevents bots from registering.
   
  Does anyone know of any extension for this?
   
  thanks
  Eric
   
  Captchas:
  http://www.google.com/search?hl=en&rls=GGLD%2CGGLD%3A2004-42%2CGGLD%3Aen&q=Captcha-createaccount

       
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