My female black neck swan (avatar picture) has been sitting on at least three eggs for about two weeks now. Could be more eggs, but I don't want to disturb her to find out, as she rarely leaves the nest. The odd thing is that she is only about 1.5 years old and most don't begin laying nearly that young, so these may be infertile. If they do hatch I would certainly want to pinion them so I would like to know what age is best to do this. Also can you put them back with the parents after pinioning, or will they reject them?
Here she is with her first egg. They built a much bigger nest with straw I provided after this. I would like to get more pictures but the male is very protective and I think it is better to give them some space.