Yeah, that is true for primates.

But I have seen a female wolf raise a fox IRL (I have a cottage in a small village in the mountains). They are prey to each other, but I saw the mother with the fox and the rest of her siblings, she made no distinction raising her biological children and the fox. I gave them food sometimes and I saw her raise them in real time. I’m still amazed by that gesture… and we think of them as animals while us that kill for no reason at all are “civilized”… at least they kill for food…