infertile

I have had success with hatching budgies over the years but I am stumped now. One of my mated pairs ( which are in their own cage with everything a budgie's heart could desire) has now laid a second clutch and again, they are infertile. They are not being disturbed, have plenty of variety in...

We have a double yellow headed Amazon who is approximatly 6-7 years old and we have owned her for 1 1/2 years. We thought she was a male how ever she laid 2 eggs about 30 days ago which are infertile as she has not been around any other birds. She is still siting on the eggs, how long should we...