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A link between eye colour and behaviour has been investigated by Morgan Worthy, a research psychologist, in both humans and animals.
In humans, he used archival records of athletic performance to show the theoretical pattern which has light-eyed athletes performing at their best on self-paced tasks and dark-eyed athletes, on average, performing at their best on reactive tasks.
This same general pattern is thought to be true in animal behavior, such as in hunting tactics of predators and escape tactics of prey. For example dark-eyed predators tend to rely on immediate, quick, reactions to catch prey, light-eyed predators tend to rely more on their ability to lie-in-wait or stalk prey.
He suggests that perception and social interaction may be linked to eye-colour too.