* Tube Feet: Starfish have hundreds of tiny, sticky tube feet on the underside of their arms. These feet are actually extensions of their water vascular system, which is a network of canals filled with water.
* Hydraulic Power: By contracting muscles, the starfish can squeeze water into the tube feet, making them extend outward. The tips of the tube feet have tiny suction cups that create a strong grip on the surface.
* Holding On: When a starfish wants to cling to a rock, it uses these tube feet to create a strong suction. They can even use their tube feet to pry open clams and mussels!
* Releasing Grip: When the starfish needs to move, it simply relaxes the muscles around the tube feet, allowing them to retract and release their hold.
So, while starfish don't have claws or glue, their unique water vascular system and tube feet allow them to cling to rocks with remarkable strength!