http://news.yahoo.com/nphotos/slideshow/photo//080122/photos_sc/2008_01_21t173643_450x336_us_amphibians/ A Gardiner's Seychelles frog rests on a thumb 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. REUTERS/Naomi Do..