http://news.yahoo.com/nphotos/slideshow/photo//080122/photos_sc/2008_01_21t173636_450x338_us_amphibians/ A Malagasay rainbow frog is seen in this undated handout. A giant Chinese salamander that predates Tyrannosaurus rex and the world's smallest frog are among a group of extremely rare amphibians identified by scientists as being in need of urgent help to survive. (George Sunter/ZSL/Handout/Re..