We used Lincoln Park Zoo in Chicago. Sizes Animals are physically designed by evolution to function well. Compare the width of the legs of large heavy animals with the width of a similar small animal. Now compare faster and slower animals, and see how the legs compare to the body. Now compare the weight of an animal with the weight of food consumed each day.
Food is necessary for energy, and that energy is mostly used to produce heat and keep the body warm.
Heat is lost from the surface, and small animals lose heat more rapidly because they have more surface compared to their weight. Compare the animals you have chosen here. If the center of gravity is not supported by the animal's legs, the animal will fall over. Look at a giraffe, a peacock, an elephant, and a large deer. Tell what animals you watched and what you observed.