JAN 03, 2018 5:42 PM PST

A walk around the block as a starfish


You may never have paused to think about how a sea star moves about on the seafloor, or even on the beach, for that matter. But sea stars, commonly called starfish, have hundreds of tiny feet on the bottom of each of their "arms," also known as rays. These little feet are called tube feet, or podia and help the animals move around, as you can plainly see in the video above. But how do they do it?!

A sea star's podia are filled with sea water, as is the sea star's vascular system. Sea stars are able to transfer water from their vascular systems into their tube feet and then use that pressure to expand them and move around. They even have muscles in their feet that allow them to retract their feet! Want to see it in action? Watch the video!
About the Author
  • Kathryn is a curious world-traveller interested in the intersection between nature, culture, history, and people. She has worked for environmental education non-profits and is a Spanish/English interpreter.
You May Also Like
SEP 10, 2020
Plants & Animals
Scientists Document Swimming Styles of Sea Butterflies
SEP 10, 2020
Scientists Document Swimming Styles of Sea Butterflies
Snails, marine and terrestrial, are likely primarily imagined to be attached to a substrate. However, under the waves, t ...
SEP 18, 2020
Chemistry & Physics
Toward Understanding Anesthesia
SEP 18, 2020
Toward Understanding Anesthesia
General anesthesia refers to the medical procedure anesthesiologists applies to patients, in order to induce paraly ...
NOV 05, 2020
Chemistry & Physics
No, Gravity Doesn't Affect How Bubbles Collapse
NOV 05, 2020
No, Gravity Doesn't Affect How Bubbles Collapse
The ubiquitous presence of bubbles makes them a common phenomenon, but interestingly our understanding of this globular ...
MAR 14, 2021
Immunology
How Are Allergies Developed?
MAR 14, 2021
How Are Allergies Developed?
You might have experienced it yourself or met someone that can not eat a certain food or can not take a specific medicat ...
MAR 06, 2021
Space & Astronomy
Astronomers Find Tectonic Activity on Exoplanet
MAR 06, 2021
Astronomers Find Tectonic Activity on Exoplanet
For the first time, researchers from the University of Bern in Switzerland have found evidence of tectonic activity on a ...
MAR 26, 2021
Earth & The Environment
Iconic Bald Eagles are Thriving
MAR 26, 2021
Iconic Bald Eagles are Thriving
Once dangerously on the brink of extinction, bald eagle populations are thriving throughout the lower 48 states of the U ...
Loading Comments...