Abstract
A complementary interplay between investigations of proximate and ultimate questions about behaviour is one of the hallmarks of ethology. Yet with the increasing specialization of both physiological and evolutionary studies, examples of cross-fertilization are becoming harder to find. One exception to this trend is a recent paper in Science 2, on the relationship between retinal growth and the ability of fish to detect their planktonic prey, that is likely to generate interest among behavioural ecologists who have been using optimality theory to investigate the adaptive basis of foraging behaviour.
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