Tens of thousands of wild geese gather at the Old Lake in Tata, a town in northwestern Hungary on Nov. 23, 2012. Every year the wild geese stop by here and then leave for the south during their winter migration. (Xinhua/Attila Volgyi)

Tens of thousands of wild geese gather at the Old Lake in Tata, a town in northwestern Hungary on Nov. 23, 2012. Every year the wild geese stop by here and then leave for the south during their winter migration. (Xinhua/Attila Volgyi)

Tens of thousands of wild geese gather at the Old Lake in Tata, a town in northwestern Hungary on Nov. 23, 2012. Every year the wild geese stop by here and then leave for the south during their winter migration. (Xinhua/Attila Volgyi) 

Some wild geese fly in a V formation over the Old Lake in Tata, a town in northwestern Hungary on Nov. 23, 2012. Every year the wild geese stop by here and then leave for the south during their winter migration. (Xinhua/Attila Volgyi)