Researchers Build Soft Starfish-Inspired Robot

A new aquatic robot mimics the movement of feather starfish using flexible arms and minimal mechanical components.

Updated on Oct. 20, 2026 in Robotics

Isometric editorial illustration of a four-armed soft robotic structure suspended in an aquatic tank, representing autonomous marine navigation technology. — Researchers have developed a soft, aquatic robot modeled after the feather starfish that maneuvers through water using only two motors. AI Illustration. Upload story photo >

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Do you prefer simpler, mechanical-based robotic designs over complex, sensor-heavy alternatives for future technology?

Researchers have developed a soft, aquatic robot modeled after the feather starfish that maneuvers through water using only two motors. The design relies on the interaction between its four flexible arms and the surrounding fluid to achieve complex movement.

Why it matters

This innovation aims to simplify robotic control systems by reducing the number of required mechanical parts. By utilizing mechanical intelligence, the design streamlines how robots navigate complex environments.

The robot features four flexible arms driven by two motors to achieve a swimming speed of 1.64 body lengths per second. It maintains a top rotational speed of 90 degrees per second.

The players

North Carolina State University

This public research university in Raleigh, North Carolina, is a leading institution for engineering and technology innovation.

University of Virginia

Located in Charlottesville, this public research university is recognized for its extensive contributions to scientific research.

University of California, Riverside

This member of the University of California system is a premier research institution that focuses on interdisciplinary scientific advancements.

The details

The robot controls the flapping of its four arms by timing motor switches, allowing for precise 3D maneuvering. This approach leverages the natural physical properties of the flexible structure to coordinate movement without complex internal systems.

October 20, 2026: The study was published in the journal Science Advances.

The Tech Race

This development reflects a shift toward mechanical intelligence, where physical design handles navigation rather than complex computational logic. It positions this research team against groups developing traditional, hardware-heavy underwater drones.

The transition toward simpler, flexible robots could eventually lead to more affordable underwater monitoring tools for environmental researchers. These systems may prove easier to maintain and deploy than current, highly complex aquatic drones.

The takeaway

Advancements in soft robotics demonstrate that intelligent design can replace the need for extensive mechanical hardware in aquatic environments. Such progress suggests a future where robots become lighter, more efficient, and easier to scale for widespread use.