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题目材料：
A recent study shows that southern fulmars bring 40 percent more food to their chicks than do the closely related Antarctic petrels. Yet fulmar chicks are only 10一20 percent heavier than petrel chicks. Hence, petrel chicks appear to be more efficient at converting their food into body mass. How can this be explained? First, while both species feed their chicks via regurgitation, petrels go on longer foraging trips. These trips may allow petrels to extract more water from the food or to partially digest their stomach contents, thereby creating more energy-rich meals. Thus petrel chicks may receive more nutritious meals than fulmar chicks. Second, fulmar chicks are less well insulated than are petrel chicks and may need to allocate a higher proportion of food energy to thermoregulation rather than growth.
以上解析由 考满分老师提供。
