Dolphins spontaneously chose a prosocial course of action that benefited their fellow dolphins. http://www.sciencedirect.com/science/article/pii/S037663571630359X …pic.twitter.com/UlHNTr9SqJ
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Tomasello reports studies where apes don't care about the results of their actions for the welfare of other apes.
They are talking about convergence, but prosocial behavior is widespread in mammals https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4296215/ …
I'd have to read it and see. But I've seen plenty of evidence that they do care normally.
For a social animal to be not prosocial is a contradiction in terms. Negative feedback would wipe them out.
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