<P> This is the stage where frogs have all four limbs and are able to walk on land, but still have their tails . They are not quite juvenile frogs . Metamorphs are roughly 2.6 cm long, but they are nearly as agile as the adult and juvenile when they emerge from the ponds . They are often mistaken for the closely related leopard frog . </P> <P> The pickerel frog's diet consists of ants, spiders, various bugs, beetles, sawfly larvae, and other invertebrates . In order to catch their prey pickerel frogs will often search grassy areas next to bodies of water . </P> <P> In case of attack, pickerel frogs have an excellent defense mechanism: they emit skin secretions which are irritating to people and toxic to some predators; making the pickerel frog the only poisonous frog native to the United States . Due to its poison, most mammals, birds, snakes and other frogs will leave the pickerel frog alone . The skin secretions of a stressed pickerel frog are known to be toxic to other frogs, as many a novice frog catcher has found when he finds only the pickerel frog still alive in his bucket . These secretions can also be moderately irritating if they come in contact with the eyes, mucous membranes, or broken skin . </P> <P> The pickerel frog's poisonous secretions cannot stop all creatures; green frogs, bull frogs, northern water snakes, eastern ribbon snakes, and common garter snakes are their usual predators . When threatened, pickerel frogs will jump into the water and dive to the bottom to escape predators like birds and snakes . </P>

Are there poisonous frogs in the united states