How do starfish regrow an arm?

Sometimes bad things happen – to starfish arms. A hungry bird takes a nibble and suddenly, that starfish is missing an arm! But in many cases, these resilient creatures can regrow a brand new one. We asked marine biologist Sophie Wolvin how that works.

 align, we’ll find an expert to answer it! 

Sometimes bad things happen – to starfish arms. A hungry bird takes a nibble and suddenly, that starfish is missing an arm! But in many cases, these resilient creatures can regrow a brand new one. We asked marine biologist Sophie Wolvin how that works.
Got a question that’s left you in limb-o? Send it to us at BrainsOn.org/contact and if the stars align, we’ll find an expert to answer it!  

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Smash Boom Best is a debate show for kids and families from the makers of the award-winning podcast, Brains On! Every episode takes two cool things, smashes them together and lets you decide which is best.


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Our mission is to encourage kids’ and curious adults’ natural curiosity and wonder using science and history…but there’s no age limit on curiosity, and episodes of Brains On can be enjoyed by anyone.


How do starfish regrow an arm?

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