 The tiger salamander ( Ambystoma tigrinum ) is typical of the frogs and salamanders that hide under cover ready to ambush unwary invertebrates . Others amphibians , such as the Bufo spp. toads , actively search for prey , while the Argentine horned frog ( <unk> ornata ) lures inquisitive prey closer by raising its hind feet over its back and vibrating its yellow toes . Among leaf litter frogs in Panama , frogs that actively hunt prey have narrow mouths and are slim , often brightly coloured and toxic , while ambushers have wide mouths and are broad and well @-@ camouflaged . Caecilians do not flick their tongues , but catch their prey by grabbing it with their slightly backward @-@ pointing teeth . The struggles of the prey and further jaw movements work it inwards and the caecilian usually retreats into its burrow . The subdued prey is <unk> down whole . 
