Evolution. New migration route could lead to new species of bird.
Pennisi
Elizabeth
E
D025041:Animal Migration; D000818:Animals; D005075:Biological Evolution; D004777:Environment; D005060:Europe; D005260:Female; D008297:Male; D046109:Passeriformes / Q000502:physiology*; D012098:Reproduction; D012621:Seasons; D012726:Sexual Behavior, Animal