Mystery Surrounding New Zealand's Deep Sea "Muriwai Monster" Is Finally Solved

By Kim Bussing on December 15, 2016

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Photo Credit: Melissa Doubleday via Facebook

The “Muriwai Monster,” a twitching black mass that washed up on Muriwai Beach, 25 miles northwest of Auckland, New Zealand, has taken the world by storm since its discovery about a week ago. Melissa Doubleday, who stumbled upon it while driving by, initially suspected it to be a whale carcass. However, when she shared images of the mysterious “creature,” which was covered in seaweed and wiggling black tendrils with white shells, on social media people around the world began speculating it was a sea monster, a “beach Christmas tree,” or even an alien time travel capsule.

But it turns out that the “Muriwai Monster” is not some fantastical beast straight out of a Harry Potter book. According to experts at the New Zealand Marine Sciences Society, it is merely a large piece of driftwood overrun by a species of gooseneck barnacles called Lepas anatifera.

Photo Credit: Melissa Doubleday via Facebook

While gooseneck barnacles are a type of shellfish, they are the only sessile crustaceans in the world. This means they behave like oysters and produce a cement-like substance that glues them to submerged objects, including ship hulls, piers, and even sea turtles, for their entire life. The crustaceans, considered a delicacy in Spain and Portugal, survive by filtering food particles from the surrounding water through their long, black feeding tentacles. Called peduncles, they can grow as long as 31 inches, which explains the strange, worm-like appearance observed by Doubleday when she first discovered the black mass.

Unfortunately, visitors hoping to witness the twitching beast in real life are out of luck given that the barnacles have now died. All that is left of the “Muriwai Monster” is a putrid smelling “carcass” that will have to be disposed of soon, if locals hope to go anywhere close to the beach.

Photo Credit: Melissa Doubleday via Facebook

This is not the first strange thing to wash ashore in New Zealand in recent times. A 7.8 magnitude earthquake that struck the island nation this November lifted the seabed by two meters, dramatically altering the landscape and stranding lobsters, abalone, barnacles, seaweed, and other sea life.

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Reading Comprehension (7 questions)

  1. What did Melissa Doubleday discover on Muriwai Beach a week ago?
  2. What did she initially believe it to be?

Critical Thinking Challenge

Just looking at the picture what would you have guessed...

Vocabulary in Context

This means they behave like oysters and produce a cement-like substance that glues them to submerged objects, including ship hulls, piers, and even sea turtles, for their entire life.


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  • VvvvvvvvvvvvFriday, July 28, 2017 at 9:51 am
    Looks like a whale
    • batkid345
      batkid345Wednesday, July 26, 2017 at 6:19 pm
      Creep 👀 Looks like a sea dragon 🐉 🐲
      • rangi456
        rangi456Tuesday, July 4, 2017 at 2:37 pm
        Wow! I didn't know about the 'muriwai monster'. When I saw the picture I thought it was a mountain covered in barnacles and seaweed. I got really fascinated about this large piece of driftwood.
        • turtlesturtles
          turtlesturtlesThursday, June 22, 2017 at 6:52 am
          New Zealand is a strange place, I've read so many weird things about it
          • akshath3013874
            akshath3013874Friday, June 2, 2017 at 11:03 am
            bad i am scared
            • SunshineMonday, May 15, 2017 at 9:54 am
              That weird I did not see the monster.
              • emmaisladybug
                emmaisladybugMonday, May 1, 2017 at 9:17 am
                that is cool but also a little creepy
                • sdobyns
                  sdobynsMonday, May 1, 2017 at 10:36 am
                  i agree so much ;]
                • frank_000
                  frank_000Friday, April 28, 2017 at 9:04 am
                  it is cool
                  • MeThursday, April 20, 2017 at 7:23 am
                    this is very intristing
                    • MYLINYBOYMonday, April 10, 2017 at 8:40 am
                      THAT IS THE MOST WIERDNESS THING EVER! 🤣🤣🤣🤣🤣🤣🤣

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