Frog sexual organ

A t the right you see two mating treefrogs. They are Squirrel Treefrogs, Hyla squirella. The smaller male is on top. As you can see in the photograph, when frogs mate, the male grasps the female's trunk with his forelimbs.
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How Frogs Work

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Frog Reproduction, from Mating to Metamorphosis | HowStuffWorks

Hayes, professor of integrative biology. The 10 percent or more that turn from males into females — something not known to occur under natural conditions in amphibians — can successfully mate with male frogs but, because these females are genetically male, all their offspring are male. Though the experiments were performed on a common laboratory frog, the African clawed frog Xenopus laevis , field studies indicate that atrazine, a potent endocrine disruptor, similarly affects frogs in the wild, and could possibly be one of the causes of amphibian declines around the globe, Hayes said. Some 80 million pounds of the herbicide atrazine are applied annually in the United States on corn and sorghum to control weeds and increase crop yield, but such widespread use also makes atrazine the most common pesticide contaminant of ground and surface water, according to various studies. More and more research, however, is showing that atrazine interferes with endocrine hormones, such as estrogen and testosterone — in fish, amphibians, birds, reptiles, laboratory rodents and even human cell lines at levels of parts per billion. Recent studies also found a possible link between human birth defects and low birth weight and atrazine exposure in the womb.
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Pesticide atrazine can turn male frogs into females

Amplexus Latin "embrace" is a type of mating behavior exhibited by some externally fertilizing species chiefly amphibians and horseshoe crabs in which a male grasps a female with his front legs as part of the mating process, and at the same time or with some time delay, he fertilizes the eggs as they are released from the female's body. Amplexus involves direct contact between male and female, distinguished from other forms of external fertilization such as broadcast spawning , where sperm and eggs are freely shed into water without direct contact by individuals. Additionally, amplexus is thought to help with the alignment of the reproductive tracts of both males and females which furthermore contributes to the achievement of successful fertilization. Amplexus chiefly occurs aquatically, but some more terrestrial anurans frogs and toads like the disc-tongued frogs Discoglossidae perform amplexus on land. In crown-group anurans like the true frogs Ranidae , the tree frogs Hylidae , and the true toads Bufonidae , amplexus is axillary in the armpits.
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A commonly used pesticide known as atrazine can turn male frogs into females that are successfully able to reproduce, a new study finds. Hayes of the University of California, Berkeley. Atrazine is banned in Europe. And since atrazine interferes with the production of the sex hormone estrogen, present in people and frogs, the findings could have implications for humans as well. Hayes and his colleagues raised 40 male African clawed frogs in water containing atrazine, from when they were larvae all the way up until sexual maturity.
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