With almost 90 species already declared extinct, the urgency for action is clear.

A quarter of freshwater animals, including fish, insects and crustaceans, are at high risk of extinction due to threats including pollution, dams and farming, according to a new study published on Wednesday.

WASHINGTON : Freshwater environments cover about 1 per cent of Earth's surface while accounting for more than 10 per cent of known species. Like many marine and terrestrial ecosystems, however, they are in distress. A new study looking at some of the denizens of freshwater habitats offers a stark illustration of