Assertion: ibis's parent | /r/CapableOf | feed larger male nestlings
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text: Although current research has yet to discover the underlying factors to why the males tend to have better survival rates under such conditions, it is suspected that the parents tend to feed the larger male nestlings first because they are either perceived by the parents to have a higher chance of survival, or, being generally larger, the male nestlings simply out-compete the small females for food.