I got tadpole-shrimp (Latin name Triops).  They are really cool, my triops eggs will hatch really soon.  They are crustatciens.  They are really cool creatures.  They are prehistoric.  The earliest fossil is from 200 million years ago.  They look like horse shoe crabs except an inch long and less spiky.  You will either get one big one or a few that are the same size because the eventually fight and only the strongest and the biggest survive you know.  That's how it works in nature.  There are no under dogs in the wild.  It's either eat, or be eaten.