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ABSTRACT A complex organism like animals, in order to become alive and perform its ecological niche has to undergo many different morphological changes. Such morphological changes greatly occur during the embroyological stage of the animal. It is the embroyological stage of an animal where many environmental factors such as temperature, weight, amount of oxygen, and exposure to light affect the development of the body organs of the animal. It is with the idea about the environmental factors that the researchers have conducted this research to find out whether temperature indeed affects the rate of development of an embryo mainly the duck embryo. Driven by the objective to find out the effect of temperature to the growth and development of duck egg, the group has undergone exact work to come up with results that are written in the succeding sessions of this research. This research aims to prove that in a living system such as a developing embryo there has to be an optimal temperature that will enable the proliferating cells to continue developing and attaining it supposedly plae in the body of a fully developed organism. INTRODUCTION The research conducted used a mallard egg known to have an incubation period of 21 days. Duck eggs share many traits with other vertebrate eggs. Most importantly, every egg--- whether a microscopic human egg, a frog egg, or a mallard duck egg--- provides the starting point for the development of what will become a complete organism. However, duck eggs, and bird eggs in general, are quite different in form and function from other vertebrate eggs, and these differences dramatically influence the path that development takes place