What does it take to encourage endangered species to breed? In the case of two frog species living at Bristol Zoo Gardens in England it takes creating a very special environment, and not just one that plays romantic music.Bristol Zoo just finished building AmphiPod, a high-tech facility that "will allow us to adjust the temperature, humidity and day length to create the perfect conditions to encourage the frogs to breed," said Tim Skelton, the zoo's curator of reptiles, in a prepared statement.