Eyesight article notes

SUMMARY:

Birds often exhibit differences in locomotion, foraging, and predator detection, many of which are often reflected in their eye sizes. Therefore, understanding the coevolutionary relationships between eye size and ecological factors, behaviours and brain size in birds is essential.

Our results indicate that species with larger eye sizes reside in dense habitats, feed on invertebrates or vertebrates and have larger brains, suggesting that habitat openness, food type and cognition play critical roles in shaping visual sensitivity and resolution.

However, we did not find any correlation between eye size and migration behaviour or foraging habitat, indicating that these factors are likely not major drivers of eye size evolution