After all it is understandable to ask:
"What are the swans eating to grow so big?"
Here are some "feeding photos".
They are vegetarian they don't kill other animals for food
They are just so nice
and some has not even voice
and they are"mute".
That I don't know how they communicate, because most birds are quite noisy.
photos are Argo exclusives.
Lucky people on British Islands where the swans love to live.
