They came a long way from sub-Saharan Africa to eastern France -- but now the Egyptian geese are quite at home there and are chasing out local ducks and swans, just one symptom of the world's ...

But the team's work on D. santomea found that the females take the lead, signaling their receptivity by spreading their wings, actively engaging with the male song, and driving the courtship rhythm.

- 'Ornamental bird' - Between 1970 and 2000 France had fewer than 50 Egyptian geese across 16 departments, according to the France's state Biodiversity Office (OFB). But from 2005, their numbers ...