Animals such a snails, and certain species of segmented worms, molluscs, crustaceans, and fish are hermaphroditic with each individual capable of producing both eggs and sperm. Star Trek: New Frontier features the hermaphrodite species, The Hermats.
Tyrone's work shows that low dose exposure during development can have insidious hidden effects that can change the chemistry of the animal and significantly affects its development." "Frogs are vertebrates like us and have similar endocrine systemsthat is they use the same hormones to control development," says David Wake, an amphibian biologist at Berkeley. We must assume that his findings have relevance for us." It is too early to say whether atrazine is responsible for the global decline in amphibian populations, but both Colborn and Wake agree that it is an angle that needs to be pursued.
"What is most disturbing," adds Wake, "is that the effects are manifested at extraordinarily low concentrations of atrazinealmost what you get from rainwater." Atrazine can be as high as 21 ppb in groundwater, 102 ppb in river basins in agricultural areas, and 224 ppb in streams in the Midwest.
There is virtually no atrazine-free environment, says Hayes, who adds that the herbicide has been used for 40 years in over 80 countries. "We have repeated Hayes' work and have seen effects only at levels of 25 ppb," says Ernest Smith, a biologist at the Institute of Environmental and Human Health at Texas Tech University.
According to newspaper reports, tests show that sex row runner Caster Semenya is a hermaphrodite .
The unreleased report shows the South African has no womb or ovaries and has internal testes – the male sex organs that produce testosterone.