Several species of amphibian live in slightly brackish water but there is only one species of toad that can live in water with very high concentrations of salt. This is the salt toad, a subspecies of the western toad, which breeds in natural or artificial salt water pools.
Like other animals that live in unnaturally high salt conditions, the toad has special glands that pump the excess salt out of its blood and into tubules that lead out onto its skin or around its eye, allowing its body to get rid of the harmful levels of sodium chloride.
Marine toads can live near the sea but cannot really cope with very high salt levels. In Australia, the marine toad was introduced to prey on pests on sugar cane field. However, the plan backfired as the toads did not like the sugar cane and instead became rampant on nearby farmlands and human settlements. The marine toad has since become a plague and it even competes with home grown species of amphibian as its large size means it can attack and eat them as well as everything else.