Data from: More than meets the eye: predator-induced pupil size plasticity in a teleost fish

Jerker Vinterstare, Kaj Hulthén, Dan Nilsson, Anders Nilsson & Christer Brönmark
1. Most animals are visually oriented, and their eyes provide their “window to the world”. Eye size correlates positively with visual performance, because larger eyes can house larger pupils that increase photon catch and contrast discrimination, particularly under dim light, which have positive effects on behaviours that enhance fitness, including predator avoidance and foraging. 2. Recent studies have linked predation risk to selection for larger eyes and pupils, and such changes should be of importance...
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These counts follow the COUNTER Code of Practice, meaning that Internet robots and repeats within a certain time frame are excluded.
What does this mean?