The mystery of the homing pigeon is in how it navigates and how it finds home 家鸽的神秘之处在于它怎么飞，怎么找到家的。
2.
Comparative research of the physiological characteristics of isolated small intestine sections from some kinds of vertebrates 家鸽离体小肠段生理特性的比较
3.
This specimen helps the students know that the physical structure of majority of birds is fit in with flying life 以家鸽为例，使学生认识绝大多数鸟类的形态结构是与飞翔生活相适应的。
4.
Psittacula agapornis ) , oscine passenon ( emberiza rutila ) and the vocalizations of sub - oscine passerine ( melopsittacus undulates , psittacula agapornis ) after sectioning nxiits were recorded by sharp gf - 6060 recorder . cooledit2000 , an acoustic analyzing software , was used to produce the original wave and it ' s expanded time windows , sonograms , spectrums and power static histograms . to distinguish the acoustic differences of their natural vocal and to find the changes of sub - oscine passerine ' s song after sectioning nxiits , the above results is acoustically analyzed and compared , expecting to provide some advantage to further explaining the mechanism of vocal production 本实验以非鸣禽(家鸽、家鸡) ，亚鸣禽(虎皮鹦鹉、牡丹鹦鹉)以及鸣禽(栗? )为实验材料，记录其正常叫声以及亚鸣禽断nxiits后的叫声，用cooledit2000声音处理软件制出原始信号及其展开图，声图，频率谱图以及能量统计分布图，并对所得结果进行声学比较分析，以期得到鸣禽、亚鸣禽及非鸣禽叫声在声学特性上的差异，以及亚鸣禽在断神经后叫声的声学变化，旨在为进一步解释其发声机制提供帮助。
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When this wall was finished , and the out - side double fenc d with a turff - wall rais d up close to it , i persuaded my self , that if any people were to come on shore there , they would not perceive any thing like a habitation ; and it was very well i did so , as may be oberv d hereafter upon a very remarkable occasion 在此期间，只要雨不大，我总要到树林里去寻找野味，并常有一些新的发现，可以改善我的生活。尤其是我发现了一种野鸽，它们不像斑尾林鸽那样在树上作窠，而像家鸽一样在石穴里作窝。我抓了几只小鸽子，想把它们驯养大。
