Ducks do fly!

In urban Russia we used to see ducks and swans not able to fly due to their trimmed feathers. Or maybe after generations of not flying there is no one to teach them fly? I wonder if a bird can learn to fly if it's parents never flown...

Here in Italy - ducks and swans do fly. But people say several years ago there were much more swans, probably they have flown away... Freedom comes with a price tag.

One can see these ducks learned a lot: how they increase angle of attack at landing to reduce landing speed, how they can land with or without thrust reversal (if they feel it's safe), how they neatly tuck in flippers in flight to reduce drag (reminds me of Boeing 737 landing gear)... They even have sharklets!