We have a new perspectives article out, proposing that interactions with rival outsiders could help explain the large amount of unexplained variation in brain size between species.
Here's the paper: https://www.nature.com/articles/s41467-020-18780-3
I've written a blog post on the Nature Ecology and Evolution community website here: natureecoevocommunity.nature.com/posts/napoleonic-intelligence-and-the-evolution-of-big-brains
Adventures of a
Dr Patrick Kennedy, Radford Lab, University of Bristol | Zoology