In Africw, the weak animals and birds are eliminated and breeding is done only between strong male and female animals orbirds. In the event of disease outbreak and drought, they send domesticated animals and birds to friends and relatives in far off locations. Why do they do this?

They know that during a drought or an epidemic , there is a great chance that their animals get infected too , and when that happens the animals would die . Most people in Africa are poor and have insufficient funds to even get medicines to even treat their own families . 
I think that the above paragraph is enough for your question .
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