⭐Starfish vs Sea urchin🥋
Starfish and sea urchins are close relatives in the echinoderm family, yet they look nothing alike. One has arms, the other a spiny ball.
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⭐Starfish
- ✓Distinctive star shape with several arms
- ✓Can regenerate lost arms
- ✓Pries open shellfish to feed
- ✓Moves on hundreds of tiny tube feet
🥋Sea urchin
- ✓Round body covered in protective spines
- ✓Grazes algae from rocks and reefs
- ✓Spines deter most would-be predators
- ✓Uses a five-toothed mouth called Aristotle's lantern
Verdict
The starfish is the iconic armed predator; the sea urchin is the round spiny grazer. Both are echinoderms moving on tiny tube feet.
Frequently asked
Are starfish and sea urchins related?+
Yes, both are echinoderms, the group that also includes sea cucumbers and sand dollars.
Can a starfish regrow an arm?+
Yes, many starfish can regenerate a lost arm, and some can regrow from a single arm.
What do sea urchins eat?+
Sea urchins mainly graze on algae and seaweed using a five-toothed mouth.
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