Blue-footed boobies have webbed feet and are comically clumsy when they walk on land. Evolutionary scientists view these feet as
◦ the outcome of a trade-off: Webbed feet perform poorly on land but are very helpful in diving for food.
◦ an example of a trait that is poorly adapted.
◦ a curiosity that has little to teach us regarding evolution.
◦ an example of a trait that has not evolved.