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  3. Allelomimetic behavior may be defined as behavior in which two or more individual animals do the same thing, with some degree of

Allelomimetic behavior may be defined as behavior in which two or more individual animals do the same thing, with some degree of

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问题     Allelomimetic behavior may be defined as behavior in which two or more individual animals do the same thing, with some degree of mutual simulation and coordination. It can only involve in species with sense organs that are well enough developed so that continuous sensory contact can be maintained. It is found primarily in vertebrate, in those species that are diurnal, and usually in those that spend much of their lives in the air, in open water or on open plains.
    In birds, allelomimetic behavior is the rule rather than the exception, though it may occasionally be limited to particular seasons of the year as it is in the redwing blackbird. Its principal function is that of providing safety from predators, partly because the flock can rely on many pairs of eyes to watch for enemies, and partly because if one bird reacts to danger, the whole flock is warned.
    Among mammals, allelomimetic behavior is very rare in rodents, which almost never move in flocks or herds. Even when they are artificially crowded together, they do not conform in their movements. On the other hand, such behavior is a major system among large hoofed mammals such as sheep.
    In the pack-hunting carnivores, allelomimetic behavior has another function that of cooperative hunting for large prey animals such as moose. Wolves also defend their dens as a group against larger predators, such as bears. Finally, allelomimetic behavior is highly developed among most primate groups, where it has the principal function of providing warning against predators, though combined defensive behavior is also seen in troops of baboons.
According to the passage, what happens to the behavior of rodents when they are artificially crowded together?
选项 A、Their allelomimetic behavior increases.
B、Continuous cooperation between them is maintained.
C、They become aggressive and attack each other.
D、They show little allelomimetic behavior.
答案D
解析 此答案可在文章的第三段中找到。啮齿动物的遗传模仿行为很少见，如果人为地把它们聚在一起，它们的行为也不会保持一致。这说明，啮齿动物没有这种功能，所以D为正确答案。
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