Food Habits of Hoplobatrachus Tigerinus (Daudin, 1802), Limnonectes Nepalensis (Dubois, 1975) and Bufo Stomaticus L ũTken, 1862 (Amphibia: Anura) in Pokhara Valley. J. Nat. Hist. Mus. 2008, 22, 134-139.