送交者: Latino2 于 2005-11-21, 14:58:40:

回答: A few years back in the U.S., there was a huge wave of cicadas. 由 Enlighten 于 2005-11-21, 14:50:53:

Their natural enemies know cicadas are food because for thousands yrs their ancestors have been learning this.

Those who don't know died out many years ago.

Evolution works.

• there are also annual ones. so you can hear that every year. - 无知 (0 bytes) 2005-11-21, 15:02:36
  • Maybe those also follow the 17-year but in different phases. - Enlighten (262 bytes) 2005-11-21, 15:07:27
    • It's a population survival strategy. - Latino2 (74 bytes) 2005-11-21, 15:11:35
      • But why in China there's no such a surge of cicadas? - Enlighten (183 bytes) 2005-11-21, 15:16:12
        • 神奇的生命质数现象——美国17年蝉揭密 (ZT) - Latino2 (1938 bytes) 2005-11-21, 15:21:32
          • 还有Qinren的《本草备要》说…… - wasguru (182 bytes) 2005-11-21, 15:51:55
            • 又昼鸣夜息，故止小儿夜啼…… - wasguru (38 bytes) 2005-11-21, 15:58:33
            • 法姑英明，亡秦文化害人不浅。 - 无知 (0 bytes) 2005-11-21, 15:55:48
          • 不准确。不是寂静十七年再度热闹。看我的连接。 - 无知 (82 bytes) 2005-11-21, 15:27:39
            • very cool. - Enlighten (0 bytes) 2005-11-21, 15:34:18
          • hehe, so it's qin-ren's fault... - Enlighten (0 bytes) 2005-11-21, 15:26:31
    • man, you didn't follow the news, did you? there ain't 17 broods. - 无知 (0 bytes) 2005-11-21, 15:10:14

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