they are vegitarians so eat grass e.t.c
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First is it the predaceous diving beetle (family Dytiscidae) water beetle, which prey on a variety of animals, including snails and fish much larger than themselves. or the water scavenger beetles (family Hydrophilidae), which eats plants. The whirligig beetles (family Gyrinidae) are oval, shiny, blue-black to dark brown beetles, about 3/4 in. (19 mm) long. They are found in groups in sheltered places, spinning around on the surface of the water. They feed on small insects on the surface and seldom dive.
well, from what I've seen they eat other bugs that fly into the water. i went to my friends house and one was eating a moth. but I know they eat algae and leafs.
I think that the water beetle eats mosquito larva, or other small water bugs/creatures. It lives in fresh water.
Most of the Hydrophilidae or water beetles are to small to bite, but the larger species might bite you, like beetles from the genus Dytiscus.