Freshwater Jellyfish Found Near Canyon Ferry Reservoir

Ten-year-old Vivi Veitch was paddling her small boat across a pond last month when something floating near the water's surface made her bring the boat to a stop.

"I thought I was seeing lots of plastic, so I tried to pick it up because you don't want plastic in the lake," Vivi recalled. "But it was really hard to pick up because it was slimy."

Vivi kept her boat motionless as she leaned in for a closer look at the penny-sized blob, whose tiny movements were barely noticeable. Puzzling at this translucent floating mystery, Vivi soon found dozens more just like it, and they started to look famil...