A tardigrade rides a nematode, in a screengrab from the award-winning video.Quinten GeldhofA baby tardigrade riding a nematode won $600 in Nikon's Small World in Motion Video Competition.Quinten Geldhof captured the video using a microscope and an iPhone. His setup cost under $1,000.The rare tardigrade footage surprised Geldhof because nematodes sometimes eat tardigrades.Tardigrades may be the world's cutest and most famous microscopic critters.Also known as water bears or moss piglets, tardigrades are waddling eight-legged animals with a reputation for survival.There are nearly 1,500 known species of tardigrade across the planet, from the poles to the tropics, from the highest mountains to the bottom of the sea.