yes they eat horses no they dont eat anything in the water with them if your horse is having problems like rotting skin you should idk take it to the vet how dumb are you
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...
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.