A new study has indicate to smooth the progress of two thirds of all kind of freshwater crab maybe at danger of going extinct, with one in six species mainly susceptible.

The study, which is the first global measurement of the extermination risk for any group of freshwater invertebrates, makes freshwater crabs among the most in danger of all groups of animals assessed so far.

Crab species in Southeast Asia are the mainly at threat, from habitat devastation, pollution and drainage.

The Zoological Society of London and Northern Michigan University Scientists led the survey, which created the first World Conservation Union Red List measurement of the 1280 known species of freshwater crab.The survey set up that 227 species should be measured as near vulnerable and critically endangered.

For another 628 species, not adequate data exists. Freshwater crabs are important to many freshwater ecosystems. Some feed on fallen foliage and algae, while other species help cycle nutrients by eating vast quantity of backlog.

The crabs themselves are a significant resource of food for a range of birds such as herons and kingfishers, reptiles such as keep an eye on lizards and crocodiles and amphibians such as frogs and toads.

Because most species require perfect water to survive, they are also brilliant indicator of good water quality.No species are yet well-known to have gone extinct, but some species such as the worldly crab Thaipotamon siamese and the waterfall crab Demanietta manii from Thailand have not been seen alive for over a century, and their innovative habitats have since been built over by urban developments.