Large brains in prey may select for adoption of anti-predator behavior that facilitates escape. Prey species with relatively large brains have been shown to be less likely to fall prey to predators. This results in the prediction that individuals that have been captured by predators on average should have smaller brains than sympatric conspecifics. https://www.soiebiologique.com/limited-price-Test-Evaluation-Command-ACU-Patch-Foliage-Green-flash-choice/