thumb|alt=Orange-thighed frogs in amplexus|Male orange-thighed frog (Litoria xanthomera) grasping the female during amplexus For the purpose of reproduction, most amphibians require fresh water although some lay their eggs on land and have developed various means of keeping them moist. A few (e.g. Fejervarya raja) can inhabit brackish water, but there are no true marine amphibians. There are reports, however, of particular amphibian populations unexpectedly invading marine waters. Such was the case with the Black Sea invasion of the natural hybrid Pelophylax esculentus reported in 2010.
thumb|alt=orange-thighed frogs in amplexus|male orange-thighed frog (litoria xanthomera) grasping the female during amplexus for the purpose of reproduction most amphibians require fresh water although some lay their eggs on land and have developed various means of keeping them moist a few (eg fejervarya raja) can inhabit brackish water but there are no true marine amphibians there are reports however of particular amphibian populations unexpectedly invading marine waters such was the case with the black sea invasion of the natural hybrid pelophylax esculentus reported in 2010