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Their nests are made of sticks and waterweeds and can float on the water, and the females usually lay clutches of 5 to 7 eggs.

Another major lake, Ulsoor, is choked with garbage and construction waste and is gasping under a blanket of thick waterweeds.

Tendai swam along the bottom, over waterweeds that bent in the current, and splashed to the surface beside a flat rock.

Owen and Ben hunted turtles among the waterweeds and pale aquatic flowers.

"I loved the dark drop, the trapped sky, the smells / Of waterweed, fungus and dank moss," he recalled in Personal Helicon.