This is the giant box tortise. It can pull it's enormous bulk into a shell no larger than a small box.
This is a distant relative. It is the box camel. It can go a tremendous distance (like the length of the living room) without getting hungry. It is very fond of popsicles.
This is the dwarf pygmy darter. It is full of energy, and can run around for hours without getting tired. Scientist have tried to harness that energy, but have failed.
This is the Zesty python. His jaws can unhinge and consume a creature ten times his size. He lures you in by being cute & cuddly, then WHAM, he's got you.
The reason these critters are endangered is because kids just grow up so fast. Enjoy them while you can.