 With a few exceptions , adult amphibians are predators , feeding on virtually anything that moves that they can swallow . The diet mostly consists of small prey that do not move too fast such as beetles , caterpillars , earthworms and spiders . The sirens ( Siren spp . ) often ingest aquatic plant material with the invertebrates on which they feed and a Brazilian tree frog ( Xenohyla truncata ) includes a large quantity of fruit in its diet . The Mexican burrowing toad ( Rhinophrynus dorsalis ) has a specially adapted tongue for picking up ants and termites . It projects it with the tip foremost whereas other frogs flick out the rear part first , their tongues being hinged at the front . 
