My husband and kids were out hiking and stopped at a stock tank to look for animal tracks. In the water, they saw these amazing prehistoric bug-looking things. They have a horseshoe-shaped shell with what looks like eyes on it. From under the open end of the shell, there is a tail with a forked end.When you flip them over, they have a dark-orange fringe that looks like millipede legs. What is it?

Ooo. Ooo. Ask me. Ask me. I know this one. Ask me. I am soooo smart.