In an alarming development, male tadpoles, when exposed to pollutants that either are or resemble estrogen, frequently grow up to become female frogs. Apparently, the transformation is occurring with such frequency that it partly accounts for the dramatic decrease scientists have recorded in the frog population.
On a contentious note, female frogs, having observed the proclivity, are apparently quite incensed that males would presume to encroach on their sexual bailiwick. Adding to the concern about the decline in frog populations, the females are threatening to stop having sex with the remaining males.