for example elephant isn’t the same size as a sheep
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There are a lot of factors. Both the environment, the amount of food, sexual selection and other factors all influence size of species.
If there’s not a lot of food, being smaller means needing less food. On an island with little food, it’s better to be small, that trait is selected for.
Species evolve to be bigger to not be vulnerable to predictors, while others evolve to be smaller, to hide.
Some animals fight physically and some kill off each others young. Being big and strong gets selected for, it gives an animal a better chance at winning fights, getting mates and being protect ones children. Think lions.
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