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As a way of illustrating1 our discussion of group behavior of animals. We are going to watch which I think is a fascinating video tape about the eland, one of the two major species antelope2 in Africa. They live in herds4 about 200 individuals. But first let's go over some of the general advantages animals get from group association. Probably the most important advantage is defense5 against predators7. Simply being in a large group it decreases the chances that any individuals will would be the victim of predator6. Cooperated defense further increases the chances of survival survivor8 for individuals and species. You will see in the video that when the herds are attacked by the hyenas9, the elands deliberately10 drive their young into the center of tightly patched group, the center being safer than the periphery11. The herd3 act in a way that increases the chances of survival of the offspring. Cooperated defense may even take the form of offense12. Some species of small birds will join together in groups to attack predator like owls13 and hawks14. Another advantage to live in the groups is a commonsense15 notion that many eyes are better than a single pair. It has been demonstrated that large herds detect predators at greater distance than do individuals. Of course there is a downside to live in groups also. But let's watch the video before we get into that.
1 illustrating | |
给…加插图( illustrate的现在分词 ); 说明; 表明; (用示例、图画等)说明 | |
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2 antelope | |
n.羚羊;羚羊皮 | |
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3 herd | |
n.兽群,牧群;vt.使集中,把…赶在一起 | |
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4 herds | |
兽群( herd的名词复数 ); 牧群; 人群; 群众 | |
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5 defense | |
n.防御,保卫;[pl.]防务工事;辩护,答辩 | |
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6 predator | |
n.捕食其它动物的动物;捕食者 | |
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7 predators | |
n.食肉动物( predator的名词复数 );奴役他人者(尤指在财务或性关系方面) | |
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8 survivor | |
n.生存者,残存者,幸存者 | |
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9 hyenas | |
n.鬣狗( hyena的名词复数 ) | |
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10 deliberately | |
adv.审慎地;蓄意地;故意地 | |
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11 periphery | |
n.(圆体的)外面;周围 | |
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12 offense | |
n.犯规,违法行为;冒犯,得罪 | |
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13 owls | |
n.猫头鹰( owl的名词复数 ) | |
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14 hawks | |
鹰( hawk的名词复数 ); 鹰派人物,主战派人物 | |
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15 commonsense | |
adj.有常识的;明白事理的;注重实际的 | |
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