Convergent Evolution
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<birdfyi-glossary slug="convergent-evolution"></birdfyi-glossary>التعريف
Independent evolution of similar traits in unrelated bird lineages, such as the similar body plans of swifts and swallows.
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Convergent evolution has produced some striking parallels in birds: unrelated swifts and swallows have evolved similar streamlined bodies and wide gapes for aerial insect catching; unrelated cormorants and darters have evolved wing-drying behavior and similar fishing methods; New World vultures and Old World vultures both evolved bald heads and soaring flight independently. DNA evidence is the primary tool for distinguishing convergence from true evolutionary relatedness.