Predators are a problem for Trinidad’s killifish: in streams where the problem is worst the killifish grow more brain cells, perhaps to help evade the hunters
Source:
https://www.newscientist.com/article/2226787-predators-may-make-prey-get-smart-and-grow-more-brain-cells/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home