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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 the primary function of allelomimetic behavior in bird is to______.
选项 A、defend nests against predators
B、look at each other
C、locate prey
D、warn against predators
答案D
解析 根据短文，鸟类遗传模仿行为的主要功能是警惕掠食者。如果选A．保护鸟巢不受掠食者侵扰。主次颠倒，不合题意。主要功能是保护鸟类本身，而不是鸟巢。如果选B．相互对视，allelommelic behavior更没有这种功能，离题太远。如果选C．放置被捕食的动物，文不对题，极不可取。
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