survey: The fate of several globally endangered species has been threatened by dwindling grasslands in Assam, which has no natural grass lands of any significance for conservation, say wildlife experts.In the first-ever World Wide Fund (WWF) survey of grasslands in the North Cachar Hills, Hamren and Barak Valley, it was found that grasslands cover less than two per cent of the total geographical area under study, adversely affecting the rich bio-diversity of the region, says Dr. Anawardin Choudhury, principal investigator for WWF's Bio-diversity Conservation Prioritization Project (BCPP).