Gurugram, June 22 -- The divisional wildlife office (DWLO) has floated two tenders to improve habitat at Sultanpur National Park ahead of the winter migratory season, for removal of invasive mesquite, aquatic weeds, hydrophytes and algae from Sultanpur Jheel and adjoining land area, officials said on Sunday. The tenders, inviting bids until June 25, aim to improve feeding and landing areas by clearing 74 acres of terrestrial habitat of scrub vegetation and nearly 50 acres of the water body of weeds, hydrophytes and algae before migratory birds arrive, while making the water surface more visible to birds from a distance. Work is likely to begin in July. Officials said Rs.13 lakh will be spent on removing aquatic weeds and Rs.5 lakh on clearing invasive musket vegetation. "The costs and timelines for both activities vary because aquatic weed and algae removal is labour-intensive," a senior official said. The department has begun testing special cameras on two of four birdwatch towers to monitor migratory bird movement and build an annual database for the bird census. "A database will help improve the tracking of migratory patterns, breeding and feeding habitats," said Ram Kumar Jhangra , divisional wildlife officer....