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It is presumed that
species with larger eyes typically have higher visual activity. Mammals such as
cheetahs or horses are guaranteed to have larger eyes that give them better
vision to avoid collisions with obstacles in their environment when they are
moving at a rapid pace.
What are some of the
ecological factors that cause mammal’s eye size to differ? It was once thought
that the time of day that the mammal is active, whether nocturnal or diurnal,
would be a main factor in the evolution of eye size. Conversely, research found
that the anatomy of the eye has shown that although nocturnal and diurnal
species differ in eye shape, they have similar eye sizes. Nocturnal species
appear to have bigger eyes because more of the cornea is exposed to let in the
maximum amount of light.
Amongst mammals,body mass plus maximum running speed can account for 89% of the variation in
eye size. Researchers also add that body size is always going to influence eye
size.
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