Lake Titicaca's endangered 'scrotum frog' could be on its last legs. Scientists hope to change that

A Titicaca water frog, nicknamed the "scrotum frog," pictured in Bolivia in August 2018.

(CNN)A group of international scientists are joining forces to save an unusual endangered species -- the so-called "scrotum frog."

The frogs -- whose scientific name is Telmatobius culeus -- primarily live near Lake Titicaca, which straddles more than 3,200 square miles across the border of Peru and Bolivia, over 3,779 meters (12,400 feet) above sea level. They're the world's largest entirely acquatic frog, and their loose skin creates folds and flaps -- which earned the species its unfortunate nickname.
The frogs, which can grow up to 20 centimeters (8 inches) long from head to rump, are considered endangered due to over-harvesting for human consumption, invasive trout that feed on its tadpoles, and the destruction of their natural habitat.
    It's hard to estimate how many frogs are left, given Lake Titicaca's vast size and the multitude of habitats it contains. But authorities and conservationists around the world have been worried for years about the frogs' decline. The population fell by 80% from 1994 to 2004, according to the International Union for Conservation of Nature (IUCN).
    Since then, the condition of the lake has only worsened, and will likely continue to deteriorate, said IUCN. In some areas of the lake on the Bolivian side, more than 90% of the population may have disappeared.
    Now, a number of scientific and wildlife institutions are launching a project to preserve the remaining frogs.