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What factor? How did the bird acquire red plummage?
How does this behaviour develop over time?
PROXIMATE: DEVELOPMENT AND CAUSATION
male birds seek out catenoid food while females seek out calorie food
What factor? Why does male seek out cartenoid food?
ULTIMATE: FUNCTION
males with brighter plummage much more likely to get a mate
reproductive function
How is the plummage function related to natural selection?
ULTIMATE: EVOLUTIONARY
bright plummage males recover from pathogens quicker, better parental care, better foragers so all produce offspring with these qualities
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