A triops (tadpole shrimp) in a drying mud puddle in the Utah Desert. It will drop eggs and die as the puddle dries. The eggs will hatch the next time the pool is filled, whether it's in a few weeks or a few decades...I raised some of these from a mail order when I was in high school. Cool to see them in the wild. Collected some mud with (hopefully) some eggs in it to raise some more and see how many generations I can keep going in a jar on my desk.