A slideshow of the newest features on Poseidon’s Web – Explain the Reef!

Do Sea Urchins Sting? No, But They Hurt All the Same

What are sea urchins? Members of Class Echinoidea, they’re distant cousins of starfishes that boast imposing defenses and bad reputations. Do sea urchins sting? Not really. It’s more that they impale. But, if you don’t bother them, these oceanic pincushions won’t bother you. The trick is in not accidentally bothering them. RATHER THAN APPRECIATING SEA URCHINS, MOST PEOPLE FLEE FROM THEM, CAREFULLY. After all, the likely result of interacting with these oceanic pincushions while doing

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Sea Turtles Fake Out Predators with Decoy Turtle Nests

When leatherback and hawksbill sea turtles finish laying their eggs in newly dug nests on a beach, they pull a fast one on would be egg poachers. They create trails and decoy turtle nests a distance away from their real egg caches, scientists say in a new paper. ON THE NATURE DOCUMENTARIES, THE PROCESS OF SEA TURTLES NESTING ON THE BEACH is both charming and straightforward: Momma turtles crawl up the sand, dig a hole,

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Akin to Brittlestars, Basket Stars Network in the Dark

Basket stars are the starfish relatives you’re least likely to see in their full glory. Key basket star fact: They do their work of unfolding their tangled arms and capturing passing prey in the dead of night.  Another: If you come across one during a night dive and stop to look at it – shining a light on it, of course – it’s going to fold right up and not quite disappear in front of

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Stars of Doom: Crown of Thorns Starfishes

Coral reefs are constantly being built up and simultaneously torn down, but Crown of Thorns Starfishes throw that equation out the window. Left to their own devices during population outbreaks, Acanthaster planci devour coral polyps and devastate reef habitats. Herewith: Crown of thorns starfish facts.  IF CROWN OF THORNS STARFISHES HAD A THEME SONG, it would be Darth Vader-type music. So destructive are these rogue echinoderms that their very name is synonymous with bad news

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All Arms, All the Time: Feather Star Facts

UNLIKELY ANIMALS THEY MAY SEEM TO OUR EYES, but feather stars are full-fledged members of the animal kingdom. Here’s a key feather star fact: They may seem to be fixed in place in their perches on coral heads or sponges  or sea rods, but these crinoid creatures eat, reproduce and move like other animals. As a bonus, they’re often beautiful and compelling.  TECHNICALLY, FEATHER STARS HAVE ARMS JUST LIKE THEIR STARFISH AND BRITTLESTAR COUSINS. At

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Brittlestars: Well-Armed, Laid-Back and Full of Tricks  

If you think of brittlestars as just a variation on the familiar, pointy starfish, think again. They’re made quite differently, they act differently and they live quite a different lifestyle.  It’s all in the long, whip-like arms. BRITTLESTARS ARE MORE THAN JUST TRADITIONAL STARFISHES WITH LONG, SINUOUS ARMS AND LAID-BACK ATTITUDES. Actually, there are many differences between brittlestars and star-shaped starfishes, both in body design and behavior. In contrast to sea stars, brittlestars have flexible,

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Fevers, Shivers & Risks: Marine Animal Group Names

We’re all likely familiar with the terms “murder” of crows and “pride” of lions for assemblages of those animals. But marine animals groups have names, too, some familiar, some strange and some… really strange. As in, a “fluther” of jellyfish, a “risk” of lobsters and a “turmoil” of porpoises.  There’s not any point to any of this but still I felt impelled to produce a list, from fishes to sea birds, sharks to pelicans, after

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These Jellyfish Sting with “Mucus Grenades”

Researchers have discovered that seemingly benign upside-down jellyfish utilize a unique, previously unrecognized weapon to capture prey: “Stinging mucus grenades.” It explains the “stinging water” pain that divers, snorkelers and waders sometimes experience without coming into actual contact with the jellies. Upside-down jellyfish have been recognized for some 200 years, but nobody knew this until now. TO ALL APPEARANCES, UPSIDE-DOWN JELLYFISH LIKE CASSIOPEA XAMACHANA spend their days resting on the shallow bottoms of reefs and

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What Are Sponges? Maybe the Future of the Reef.

What are sponges? They’re animals, perhaps animals that stretch our conception of the term, but animals for sure. It’s easy to dismiss them as just backdrop scenery to more exotic stuff on the reef. But ocean sponges come in amazing shapes and colors, chug along with body features unique in the animal kingdom and perform important reef-related roles.  Sponges were among the earliest arrivals in the ocean. And, if corals disappear, sponges may be the

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Seeking Fish, Patrolling Albatrosses Join the Cops

In an innovative experiment to help find commercial fishing vessels poaching in restricted waters, scientists have attached tiny radar detectors to high-soaring albatrosses, renowned flyers known for their attraction to ships at sea. Patrolling albatrosses revealed that about a third of ships in the Southern Indian Ocean were seeking to avoid detection. TWO IMMUTABLE FACTS: 1) IF THERE’S FOOD AROUND, ANIMALS WILL SHOW UP FOR AN EASY MEAL. 2) There are always going to be

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