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As of December 2021, the International Union for Conservation of Nature (IUCN) lists 673 critically endangered amphibian species, including 146 which are tagged as possibly extinct. [1] [2] 9.2% of all evaluated amphibian species are listed as critically endangered. No subpopulations of amphibians have been evaluated by the IUCN.
Additionally 1193 amphibian species (16% of those evaluated) are listed as data deficient, meaning there is insufficient information for a full assessment of conservation status. As these species typically have small distributions and/or populations, they are intrinsically likely to be threatened, according to the IUCN. [ 2 ]
Paedophryne amauensis, also known as the New Guinea Amau frog, is a species of microhylid frog endemic to eastern Papua New Guinea. [2] [4] At 7.7 mm (0.30 in) in snout-to-vent length, it was once considered the world's smallest known vertebrate.
It can reach up to 50 kg (110 lb) in weight and 1.8 m (5.9 ft) in length, making it the second-largest amphibian species, [4] [8] after the South China giant salamander (Andrias sligoi). [18] The longest recently documented Chinese giant salamander, kept at a farm in Zhangjiajie , was 1.8 m (5.9 ft) in 2007. [ 6 ]
The world’s frogs, salamanders, newts and other amphibians remain in serious trouble. A new global assessment has found that 41% of amphibian species that scientists have studied are threatened ...
In the late 1960s, an expedition led by Jacques Cousteau reported Titicaca water frogs up to 60 cm (2 ft) in outstretched length and 1 kg (2.2 lb) in weight, [11] [12] [13] making these some of the largest exclusively aquatic frogs in the world (the exclusively aquatic Lake Junin frog can grow larger, as can the helmeted water toad and African goliath frog that sometimes can be seen on land). [14]
That's because the amphibian can regenerate brains, jaws and even spines without scarring. Scientists have even transplanted organs from one individual axolotl to another with no complications.
The Wyoming toad (Anaxyrus baxteri), also known commonly as Baxter's toad, is a species of toad in the family Bufonidae.The Wyoming toad is an extremely rare amphibian that exists only in captivity and within Mortenson Lake National Wildlife Refuge in Wyoming in the United States.