I had a drake and a female rouen who are about 2 years old. Eggs daily are great, we typically collect for eating/baking, etc.
However, recently a fox got into our pen and took our drake. We know our hen only had 2 eggs layed in the nest, we check every day. So our drake was gone, but somehow she laid an additional 7 eggs and since we felt bad about her being alone we did not collect the eggs and let her hatch them, figuring we would get one or two ducklings and the rest would not hatch. However all 7 hatched, so can a female duck keep the fertilization in her body and use it at any time? or did a wild duck come in and fertilze our eggs? We know she only had 2 eggs in that nest, she has been known to lay one in am and one pm once in a great while but not too often. She is an excellent egg producer and a fabulous mother duck. This will be her 2nd brood. The first brood was 9 ducklings last year, all survived we found homes for all of them. But we can't figure out how more than 2 eggs got fertilized, can anyone help with that question?