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Review - Article Example rcadian process or organization is not influenced by the absence of environmental periodicity; these biological processes continue taking place with regularity at a 24 hour interval. The goal of this research paper is to analyze that which among ‘retina’, ‘pineal’ or ‘parietal eye’ is mainly engaged in the generation and control of circadian rhythm of the body temperature. In order to come to any conclusion, an experiment is carried out on ‘iguana’. Iguana is a genus of herbivorous lizards. According to previous research, In order to check for same objectives, experiments were carried out on other species as well, experiments on Sparrows showed that removal of pineal abolishes circadian body temperature, while experiments on pigeons show that circadian rhythms of locomotor activity and body temperature is abolished by the removal of pineal and the retinas. Different studies showed different results. This study analyzes the circadian system in lizards and its affect by the environment. This research paper evaluates the experiment of seven adults and twenty five juveniles which are put under observation. All lizards are experimented differently, some of them were experimented after the removal of parietal eye, some of them were observed after the retina and pineal surgery. One of the major significance of putting the circadian system under observation is that the study of circadian system is important for determining sleep patterns, hormone release, body temperature and body functions. The results showed that ‘pineal’ is centrally involved in the control of circadian system of the lizards. Apart from coming to the conclusion that among ‘retina’, ‘pineal’ and ‘paternal eye’, ‘pineal’ is the central part that plays an important part in the generation of circadian rhythm of the body temperature it also detects that ‘pineal’ is marginally involved in locomotor rhythmicity. Thus, to conclude it can be said that the study also