The Oriental Fire-bellied Toad, (Bombina orientalis) is a small (4 cm, 2") semi-aquatic frog species found in Korea, north-eastern China and adjacent parts of Russia. An introduced population exists near Beijing. They are commonly kept as pets in land and water vivariums. The orientalis is also known as the tuti 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 (generally bright reddish-orange) 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 (Bufonidae.) As such, it may properly be referred to as a frog.
They are noted for their bright green and black coloration on their backs, and brilliant orange and black on their underside. In the wild, B. orientalis eat various types of small aquatic arthropods (among other things) from which they obtain Carotene, which helps to color their bellies. These bright colors serve as a warning to predators of toxicity. The toxin is secreted through the skin mostly on the hind legs and sometimes the belly in a milky-like substance when the frog is disturbed or frightened. Not only will they emit this toxin, they will also lay on their back to show the colour of the belly, indicating its toxicity to any predators.
Like other Bombina species, Bombina orientalis is semi aquatic, inhabiting warm, humid forested regions. They spend most of their time on land.
Breeding takes place in the spring with the warming of the weather and increase in rain. Males call to the females with a light barking croak. They jump onto the back of any other fire-bellied toad that happens to pass by, often leading to male-male confusion, but rarely any sort of fighting. Females lay anywhere from 40 to 100 eggs in a large cluster, usually around submerged plants, near the water's edge. Tadpoles hatch from the eggs in 3–10 days depending on the temperature of the water. The larvae begin to develop legs in 6–8 weeks, and are fully metamorphosed and begin venturing on land in 12–14 weeks.