Green frogs in the suburbs are seeing a gender revolution.
A new Yale study shows that estrogen in suburban yards is changing the ratio of male and female green frogs at nearby ponds. Higher levels of estrogen in areas where there are shrubs, vegetable gardens, and manicured lawns are disrupting frogs' endocrine systems, according to the study. That, in turn, is driving up the number of female frogs and lowering the number of male frogs.
The research appears in the journal Proceedings of the National Academy of Sciences. It is based on tests conducted at 21 ponds in southwestern Connecticut in 2012.