How do I get my two female cockatiels to stop laying eggs and setting? They are 7 and 9 years old, and have done this for the past 2 years, but this year it has gone on for at least a months so far. I worry about their health, getting egg-bound, etc. I have them in a large cage with newpaper over the wire bottom. I hate to take out he newspaper since the wire is such a pain to clean, but I will if that is the only way to get them to stop. Silly girls.