Among birds and some other organisms siblings will kill each

Among birds (and some other organisms), siblings will kill each other when still being cared for by parents under some circumstances. It is thought that this has evolved to maximize fitness. Under what circumstances would this occur? Hints when resources are low O only when the other sibling is loaded with parasites Oalways, so that the winner can take all the resources never 0 only when one sibling is big enough to get away with it

Solution

When resources are low

When the parent species find difficult to raise more than one child.... the older child or bird kills it\'s younger sibling so that it can get the resources to survive....