Within a species, egg size may differ. For example, younger birds of a species tend to lay smaller eggs than older birds of the same species. Even eggs laid by a particular bird may vary in size, both within and between clutches. Food availability is a controlling factor. A clutch is the total number of eggs laid by one bird during one nesting. If you were advising a bird, would you recommend that it lays four large eggs or five smaller eggs? Can you imagine situations where one strategy is better than the other?
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