Amphibians beginning with O

Oak Toad - The Oak Toad or Anaxyrus quercicus, is a species of toad in the Bufonidae family. It is endemic to the coastal regions of southeastern United States

Ocoee salamander - The Ocoee Salamander is a species of salamander in the Plethodontidae family. Its natural habitats are temperate forests, rivers, intermittent rivers, freshwater springs, and rocky areas.

Odaigahara salamander - The Odaigahara Salamander is a species of salamander in the Hynobiidae family. It is endemic to Japan. Its natural habitats are temperate forests, rivers, and freshwater springs. It is threatened by habitat loss.

Oedipina - Oedipina complex is a species of lungless salamander found in western South America from Costa Rica to western Colombia and northwestern Ecuador. It was formerly known as Oedipus complex.

Oita salamander - The Oita Salamander is a species of salamander in the Hynobiidae family. It is endemic to Japan. Its natural habitats are temperate forests, rivers, intermittent rivers, freshwater marshes, intermittent freshwater marches, and irrigated land. It is threatened by habitat loss.

Oki salamander - The Oki Salamander is a species of salamander in the Hynobiidae family. It is endemic to Japan. Its natural habitats are temperate forests, rivers, and plantations . It is threatened by habitat loss.

Oklahoma salamander - Its natural habitats are temperate forests, rivers, and freshwater springs. It is threatened by habitat loss.

Olive Snout-burrower - The Olive Snout-burrower is a species of frog in the Hemisotidae family. It is found in Democratic Republic of the Congo and possibly Uganda. Its natural habitats are subtropical or tropical moist lowland forests, swamps, freshwater marshes, and intermittent freshwater marches. It is threatened by habitat loss.

Olongburra frog - Its natural habitats are subtropical or tropical swamps, Wallum swamps, freshwater lakes, intermittent freshwater lakes, freshwater marshes, and intermittent freshwater marches.

Olympic salamander - Its natural habitats are temperate forests, rivers, and freshwater springs. It is threatened by habitat loss.

Omei horned toad - The Omei Horned Toad is a species of amphibian in the Megophryidae family. It is found in China and possibly Vietnam. Its natural habitats are subtropical or tropical moist lowland forests, subtropical or tropical moist montanes, and rivers. It is threatened by habitat loss.

One-toed amphiuma - The One-toed Amphiuma is an aquatic, eel-like salamander native to the southeastern United States. It was unknown to science until 1950, when it was collected by herpetologist W. T. Neill. It is rarely observed in the wild, and much about the species remains uncertain.

Orange-bellied frog - G. vitellina is very similar in appearance to Geocrinia alba ; having spots of dark brown on a light brown or grey back, with has a snout-vent length of 17-24 mm. The underparts, however, are paler and vivid orange in the front. It is part of the Geocrinia rosea frog complex.

Orange-crowned Toadlet, Western Toadlet - The Orange-crowned Toadlet or Western Toadlet is a species of frog in the Myobatrachidae family. It is endemic to Australia. Its natural habitats are temperate shrubland, Mediterranean-type shrubby vegetation, intermittent rivers, intermittent freshwater lakes, freshwater marshes, intermittent freshwater marches, and rocky areas.

Orange-thighed Frog - The Orange-thighed Frog is a medium-sized tree frog, reaching a length of 5.5 centimetres. It is a slender frog, with a thin body, flat head and large eyes, which are orange in colour. It has a green dorsal surface, with bright yellow feet, vocal sac and a yellow band down its flank. The inner surface of its legs are yellow, and the outer surface is green. It is distinguished, physically, from the Red-eyed Tree Frog by the presence of bright orange thighs, the Red-eyed Tree Frog has mavue thighes.

Oregon Spotted Frog - The Oregon spotted frog reaches a length of 4 centimetres to 10 centimetres . Females are slightly larger than males. These frogs range in color from green to reddish-brown and have black spots on the head and back. Rana pretiosa is identifiable by the reddish or salmon on sides and venter and eyes slightly upturned.

Oriental Bell Toad, Oriental Fire-bellied Toad - Oriental fire-bellied toads are the most easily recognizable species of Bombina. They are typically a bright green with black mottling dorsally, but their coat may also darken to brown and even black depending on the scenery presented. Like other Bombina species, Bombina orientalis have a bright yellow to red ventral region mottled with dark brown to black. The skin on their dorsal side is covered in small tubercles. Although it is typically referred to as a toad, the Fire-Bellied Toad is not a member of the toad family As such, it may properly be referred to as a toad.

Oriental Fire-bellied Newt - Chinese Firebelly Newts are mildly poisonous and excrete toxins through their skin. Consisting primarily of tetrodotoxins, newts of the genus Cynops pose a medically significant threat if enough toxins are consumed . Despite this, skin excretions alone are unlikely to be harmful to humans unless the entire animal is swallowed. Regardless, the washing of hands before and after contact with these or any amphibian is important to reduce the risk of transferring toxins or disease to and from the animal.

Orlov's Treefrog, Orlov Frog - Rhacophorus orlovi is a species of frog in the Rhacophoridae family. It is found in Laos, Thailand, and Vietnam. Its natural habitats are subtropical or tropical moist lowland forests, rivers, freshwater marshes, and intermittent freshwater marches. It is threatened by habitat loss.

Ornamented Pygmy Frog - Frogs of the genus Microhyla are small. They can be identified by the typical Arrow shaped mark on their dorsal side. They are generally of yellowish color with dark brown patch.

Ornate Chorus Frog - The name of the genus comes from the Greek pseudes and akris , probably a reference to the repeated rasping trill of most Chorus Frogs, which is similar to that of the insect. The species name is from the Latin ornatus .

Ornate horned frog - The females can grow to be 14 centimeters long and the males 10 centimeters . The lifespan is 6 to 7 years, however they can live up to 10 years. The Horned frogs' most prominent feature is its mouth, which accounts for roughly half of the animal's overall size. Coloration is typically bright green with red markings, though dark green, parti-color black and albino versions also exist. Sexing this species is very difficult, and the only dimorphism between the two sexes is size and that males have dark pigmented throats.

Oshan Metacarpal-tubercled Toad, Pigmy Crawl Frog - Its natural habitats are temperate forests, subtropical or tropical moist lowland forests, subtropical or tropical moist montane forests, and rivers. It is not considered threatened by the IUCN.

Ouachita salamander - The Ouachita Dusky Salamander is a species of salamander in the Plethodontidae family. It is endemic to the United States. Its natural habitats are rivers and intermittent rivers.

Oxapampa Poison Frog - The Oxapampa Poison Frog or Rana Venenosa is a species of frog in the Dendrobatidae family. It is endemic to Peru. Its natural habitats are subtropical or tropical moist montanes and rivers. It is threatened by habitat loss.

Ozark Zigzag Salamander - Its natural habitats are temperate forests, freshwater springs, rocky areas, and caves. It is threatened by habitat loss.