> Some birds will abandon weaker chicks to focus on the ones most likely to survive. Others will allow siblicide. That these behaviors exist and have existed for billions of years is a fact orthogonal to morality because birds don’t have the capacity to reason about systems and the mortality of actions.

There's something missing from this analysis. Namely that animals that have many offspring generally expect most of them to die and this is part of selective pressures that keeps the population healthy. If, for example, a mouse could reason morally it might still let many of its weaker babies die because keeping them alive would not be good for mouse-kind. It's inappropriate to assume that the child rearing morals of a low-fecundity, high-parental-investment species like ourselves applies to other species with different reproductive strategies.