I am sure this will come as no great shock to you,
@Carbon, but I have an uncommon take on this. It is not something I have heard discussed in any Christian church, ministry, or organization. It is just me contemplating scientific and theological facts and seeking ways to bring them into harmony. After a couple of years of wrestling with questions like this—especially those involving Adam and Eve and the events in Eden—I have developed a tentative and provisional view. Let me share it with you and maybe get some feedback (or even pushback).
At this point, I am exploring a distinction between wrongdoing and sin, the former representing a horizontal dimension (morally culpable before others) and the latter representing a vertical dimension (morally culpable before God). Such a distinction would help make sense of why some things can be good in human terms but a sin against God.
So,
humans are not unique with respect to wrongdoing, but they are entirely unique with respect to sin. There are many animal groups that exhibit what skeptic Michael Shermer called "premoral sentiments" that developed from animal sociality. These are things like attachment and bonding, cooperation and mutual aid, sympathy and empathy, direct and indirect reciprocity, altruism and reciprocal altruism, conflict resolution and peacemaking, awareness of and response to the social rules of the group, and so on. I am willing to grant that some animals are capable of wrongdoing and may be held culpable to those in their group—the evidence is substantial and basically impossible to ignore—but that wrongdoing cannot be a sin against God without a covenant relationship defining that term.
As far as I can tell, it would seem to follow from the biblical witness that there is no such thing as sin apart from a covenant relationship with God. So, humans are sinners while elephants are not. Out of all the creatures on Earth, only humans are capable of and culpable for sin, despite the fact that other creatures demonstrate characteristics of moral agency. I am considering that this would have been the case for humans prior to Adam and the garden, being culpable for wrongdoing against one another but not culpable for sin against God. Sin was a meaningless term until the events of the garden.
Once that covenant relationship was established, however, sin became a potential—
but not an actuality until Adam disobeyed God (thus preserving Augustinian orthodoxy). That broken covenant relationship is why we require salvation. The first federal head became a covenant-breaker (as are all those in Adam), while the last federal head became a covenant-keeper (as are all those in Christ).
P.S. This view would also explain how Adam and Eve could understand disobedience as wrong.