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I have a female Peach that has laid eggs a number of times in the last several years. I have added a second Peach in the cage with her. The new bird is about 7 months old. Since adding the second lovebird, the original female has had two nests, both unfertilized. Is there a chance that the new lovebird is a male, but not old enough to be effective in fertilizing the female? At what age does a male lovebird become capable of fertilizing during mating? Thank you for your insight.

Minimum breeding age for Peachfaced Lovebirds is 12 months, although lovies are definitely capable of breeding as young as 6 months but it's risky for their health.

Could be the male is not really a male. I would DNA sex him just to make sure. He also may not know what he's doing, so, yes, age can be a factor.

Linda, thank you very much. You have been quite helpful.