Here's what it's for:
* Swimming: The telson acts like a rudder, helping them steer and maintain balance while swimming.
* Sensory: It has sensory bristles that help them detect changes in their environment, like currents and food.
* Egg carrying: Female sea monkeys use their telsons to carry their eggs.
So, while it looks like a tail, it serves a variety of functions crucial to their survival in the water!