So what do they eat? Mainly they feast on mosses, flowering plants, bacterias, and lichens, or as they are more commonly known, fungi. They are also known to slurp on animal cells, and some of them are actually cannibals, eating other tardigrades. They suction out the fluids that are nutrient-rich after using that kind of disturbing mouth to puncture the cell walls and membranes of their targets. It’s a really good thing they don’t have a taste for us, or they wouldn’t be quite so cute anymore.