Description: This article discusses the ratio of male birth to female birth, which is dropping. The experts cite older ages of parents, environmental pollution, fertility drugs, and other factors. This article discusses the observation that throughout nature, the ecosystem maintains a remarkable stability. Due to declining mortality rates for males relative to females, fewer males need to be born now to maintain equal numbers of males and females during the reproductive years. This may be a factor in the decline of the ratio of males born to females born.