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In case of human beings, the ratio of weights of head:body is high,while in case of buffaloes,it is less, so, the effective density of buffaloes in case of head is less than water, so,they can easily keep their head above water, but humans can't.
So, a buffalo floats on the river but not the man.

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According to  archimedes principal whose density is less than the density of liquid,it floats on liquid. so, buffalo`s density is less than the river`s water while man`s more
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Delete this answer please.I am sorry.It is not written by me
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