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starfish

Starfish (Sea Star)
Image: National Geographic

Starfish (Sea Star)

Starfish are going by a new name these days: sea stars. These slow-moving invertebrates seem tame — until you find out how they hunt, eat, and regenerate arms. The beautiful crown of thorns also packs a venomous punch.

Explore more than 2,000 species of sea stars, or starfish.

National Geographic
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Deadly 60: Killer Crown of Thorns

Deadly 60: Killer Crown of Thorns

The crown of thorns is a venomous starfish that feasts on coral by vomiting its stomach lining, which contains toxic juices that dissolve the coral. Watch this large, spiny starfish in action. More...

Video
BBC
How Do You Electronically Tag a Starfish?

How Do You Electronically Tag a Starfish?

Tagging a starfish with a tracking device isn’t so simple when it can shed the tagged arm. Discover how marine biologist Miles Lamare solved this perplexing problem. More...

Video
Science Learning
Monster Worm and Sea Star Frenzy

Monster Worm and Sea Star Frenzy

In this vivid, time-lapse video, sea stars, monster worms, and sea urchins swarm the Antarctic Ocean floor. A rare, tasty surprise has triggered their feeding frenzy. More...

Video
BBC
Scientists Zero In on What’s Causing Starfish Die-Offs

Scientists Zero In on What’s Causing Starfish Die-Offs

Millions of starfish are dying along North America’s Pacific shore. Are rising water temperatures to blame? Investigate sea star wasting syndrome. More...

Article
PBS NewsHour
Sea Star

Sea Star

What do sea stars have in common with daffodils? They are both pentamers. Find out more about radial symmetry and pentamerism in nature. More...

Article
National Geographic
Sea Star Anatomy: Part 1

Sea Star Anatomy: Part 1

This video offers a quick starfish anatomy lesson, introducing its mouth, tube feet, central disc, and madreporite. You’ll also learn the first steps of dissection. Get your scissors ready. More...

Video
MacOrganisms2
Sea Star Anatomy: Part 2

Sea Star Anatomy: Part 2

The dissection continues in this second video on starfish anatomy. See what lies beneath the starfish's skin, learn about its organs and water vascular system, and discover this creature’s bizarre way of eating. More...

Video
MacOrganisms2
Sea Stars

Sea Stars

Starfish can choose to reproduce asexually by splitting themselves down the middle. Check out their other amazing adaptations, including regeneration and chemical defenses. More...

Interactive
Science Learning
Sea Stars: Photo Gallery

Sea Stars: Photo Gallery

Check out stunning photos of starfish, including the multi-armed sunflower sea star and the basket star, which bears a peculiar web of branching arms. Facts accompany each photo. More...

Images
National Geographic
Starfish (Sea Stars): Regenerating Their Arms

Starfish (Sea Stars): Regenerating Their Arms

Sea stars have the amazing ability to drop damaged arms and grow new ones. This video showcases regeneration in Northern sea stars. Take a look. More...

Video
Timothy F. Sheehan
Starfish Game

Starfish Game

Starfish predators include sharks, manta rays, Alaskan king crabs, and other starfish. While the small, starfish-gobbling fish in this game defies reality, guiding it through an ocean maze is a lot of fun. More...

Game
Bgames.com
Storms, Starfish, and Warmer Waters Wiped Out Half of Great Barrier Reef Coral

Storms, Starfish, and Warmer Waters Wiped Out Half of Great Barrier Reef Coral

What's killing the coral on Australia's Great Barrier Reef? Starfish are partially responsible, but there's a bigger story here. A coral reef biologist explains the natural and human-related factors linked to its alarming decline. More...

Video
PBS NewsHour

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