Raup D M
The University of Chicago, IL 60637.
Acta Astronaut. 1992 Mar-Apr;26(3-4):257-61. doi: 10.1016/0094-5765(92)90108-u.
Animals lacking humanoid intelligence have evolved systems indistinguishable in function, if not in structure, from systems built by humans. Although radio communication has never been verified in animals, it is completely feasible biologically. If such systems are present in non-intelligent organisms on other planets, then our chances of detecting life in the universe by current SETI methods are greatly enhanced.
缺乏类人智能的动物已经进化出了一些系统，这些系统在功能上（即便不是在结构上）与人类构建的系统难以区分。尽管动物之间的无线电通信从未得到证实，但从生物学角度来看这是完全可行的。如果其他行星上的非智能生物存在这样的系统，那么我们通过当前搜寻地外文明计划（SETI）的方法探测宇宙中生命的几率将大大提高。
