One hundred critically endangered spray toads, bred in laboratories in the United States, were returned to Tanzania last week for the first time in 10 years. (Courtesy of The Toledo Zoo/R. Andrew Odum)
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About the size of nickel or a quarter, the spray toads are also unique in that they give birth to fully developed babies rather than laying eggs. (Courtesy of The Toledo Zoo/Tim Herman)
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The Kihansi waterfalls in Tanzania where a new hydropower dam has reduced the habitat of the toads that live in the spray of the falls. (Maura O'Connor/GlobalPost)
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Biologists in yellow slickers work in the artificial spray zone near the Kihansi waterfalls where toads will be placed and where scientists hope they will thrive. (Maura O'Connor/GlobalPost)
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Some Tanzanian technicians are trained in the husbandry of the Kihansi spray toads at The Toledo Zoo. (Courtesy of The Toledo Zoo/R. Andrew Odum)
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Kihansi spray toads copulating. The number of toads is now around 5,000. The hope is that a number of toads can be returned to their original habitat, though no one is sure if they will be able to survive in the wild anymore. (Courtesy of The Toledo Zoo/Tim Herman)
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