Vegavis, lived in Antarctica 70 million years ago, during the Cretaceous period. Although birds clearly evolved by 150 million years ago, exactly when the modern groups of birds arose has proved a subject of debate. Researchers describing Vegavis in the current issue of Nature contend that it is a relative of today's ducks and geese. If so, birds of modern aspect emerged before the end of the Cretaceous, rather than in the Tertiary period as some scholars have believed.