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Some species of frog have adaptations that allow them to survive in oxygen deficient water. The Titicaca water frog ( Telmatobius culeus) is one such species and has wrinkly skin that increases its surface area to enhance gas exchange. It normally makes no use of its rudimentary lungs but will sometimes raise and lower its body rhythmically while on the lake bed to increase the flow of water around it. [71] Anatomical model of a dissected frog: 1Rightatrium, 2Lungs, 3Aorta, 4Egg mass, 5Colon, 6Leftatrium, 7Ventricle, 8Stomach, 9Liver, 10Gallbladder, 11Smallintestine, 12Cloaca Digestion and excretion

a b Howard, Ian P.; Rogers, Brian J. (1995). Binocular Vision and Stereopsis. Oxford University Press. p.651. ISBN 978-0195084764.The unusual appearance of the frogfish functions to conceal it from predators and sometimes to mimic a potential meal to lure it in. In the study of animal behavior, this is known as aggressive mimicry. Their unusual shape, colour, and skin textures disguise frogfish. Some resemble stones or coral, while others imitate sponges or sea squirts with dark splotches instead of holes. In 2005, a species was discovered, the striated frogfish, that mimics a sea urchin, while the sargassumfish is coloured to blend in with the surrounding sargassum. [5] Some frogfish are covered with algae or hydrozoa. Their camouflage can be so perfect that sea slugs have been known to crawl over the fish without recognizing them. [ citation needed]