|Titicaca water frog|
|Juvenile from Isla del Sol|
Telmatobius culeus, commonly known as the Titicaca water frog, is a very large and critically endangered species of frog in the Leptodactylidae family. It is entirely aquatic and only found in Lake Titicaca and rivers that flow into this lake in South America. While the lungs are greatly reduced, this frog has excessive amounts of skin, used to help the frog breathe in the high altitude in which it lives.
In reference to its excessive amounts of skin, it has also jokingly been referred to as the Titicaca 'scrotum' water frog.
In the early 1970s, an expedition led by Jacques Cousteau reported frogs up to 50 centimetres (20 in) in outstretched length, with individuals commonly weighing 1 kilogram (2.2 lb), making these some of the largest exclusively aquatic frogs in the world (the fully aquatic Batrachophrynus macrostomus is larger, as is the African goliath frog, which sometimes can be seen on land). The snout-vent length is 7.5–13.8 centimetres (3.0–5.4 in).
Once common, the Titicaca water frog has declined drastically and is now facing extinction due to over-collecting for human consumption, pollution, and predation of tadpoles by introduced trout. It may also be threatened by the disease chytridiomycosis. Several other species in the genus Telmatobius are facing similar risks.
The skin flaps, whilst primarily used for breathing, can also be used to help the frog glide safely to the ground should it ever find itself falling from a great height. 
- Stuart, Hoffmann, Chanson, Cox, Berridge, Ramani and Young, editors (2008). Threatened Amphibians of the World. ISBN 978-84-96553-41-5
- 2004, Amphibiaweb, IUCN, Conservation International, and NatureServe
- Victoria Gill (12 September 2013). "Blobfish wins ugliest animal vote". BBC News. Retrieved 12 September 2013.
- Danzibar Slorrigan's Great Big Book of Everything (chapter 367 - The Titicaca Frog)
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