some basic knowlege
By xiaowen187
@xiaowen187 (426)
China
November 14, 2008 1:42am CST
i read this information from a newspaper. that not all the birds can sing unless they can hear their parents' singing after their birth. and the cat should also have light to learn how to use their eyes. if the conditon can not meet the demand, then they will lose this skills forever
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