科学家说这个新的证据首次表明脑袋尺寸是影响动物在城市环境中生存的关键因子。
Scientists say this new evidence is the first to show that brain size is a key factor for animals' survival in urban environments.
伯施说，利他主义行为在圈养环境下发生的并不那么频繁，因为圈养动物不需要只有抱成团才能生存下去。
Boesch says altruism may not show up as often in captivity because captive animals don't need to stick together to survive.
科学家称，每种性格都能帮助这种巨型哺乳动物在严酷环境中生存，这在动物王国中几乎是独一无二的。
Each of the types has developed to help the giant mammals survive in their harsh environment and are almost unique in the animal kingdom, according to the scientists.
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