A CAPTCHA (Completely Automated Public Turing test to tell computers Computer and Human Apart) challenge using captcha as graphical password is used as authentication mechanism. In this paper, floating captcha security is integrated to make the system secure. Captcha technique is improved by adding floating capability to captcha. Apart from floating captcha click animal, captcha zoo and animal grid technologies are also used to enhance security. It eliminates the chances of shoulder surfing attack, image hotspot problem, online guessing attack, human based hacking attack and relay attack.