الفهرس 
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Abstract
lthough data are accumulating on the energetics of poik- ilothermic terrestrial vertebrates (e.g. Alexander and Whitford, 1968; Mueller, 1969, 1970; Kitchell and Windle, 1972; Gradzinski, et al, 1975), yet there are no comprehensive studies regarding the effects of seasonal variations on food consumption and met- abolic activity.
Hence the growth rates reflect the partitioning of the energy resources available to an individual into growth. Such consider- ation is necessary for meaningful comparisons of energy flow among poikilotherms.
This endeavour was conducted to study the feeding behaviour and examine the effects of seasonal variations on the food cons- umption and growth rate of the Egyptian lizard Chalcides ocellatus. In addition, food and feeding habits of the experimental animal and oxygen consumption were also determined in order to estimate the energy requirements of the animal.
1. Food quality, abundance and habits:
Differences in food quality have been shown to affect the population parameters such as growth and reproduction in several groups of invertebrates as Diptera larvae (Hughes and Walker, 1970), Trichoptera (Iversen, 1974), Diplopoda (Kayed, 1974, 1977) and Collembola (Booth and Anderson, 1977). In general, the consumption rate will vary with the avilability of food and intensity of intraspecific competitions.