这句话中的for those of you who dont know起到什么用途呢

All right, hold on a moment. I'm familiar with the study you're talking about. And for those of you who don't know, prairie dogs are not actually dogs. They're a type of rodent who, who burrow in the ground in the grasslands of the western United States and Mexico.

我感觉把for those of you who don't know删掉才更顺，不理解这么说话的意义

for those of you who don't know， 指对你们其中一些不太懂这种动物的人来讲，prairie dog 事实上它不是狗，是一种啮齿动物。整段是口语体的表达，说话人这个时候可能喜欢加如此一个限定，感觉严谨。