ABC Brisbane who forwarded it to Queensland Museum where experts identified it as an Obese Sea Pen (Cavernularia obesa). The animals are also known as Fat Sea Pen, Hair Sea Pen, Obese Sea Finger, Octocoral, Sea Cactus, Sea Feather, Sea Finger, Sea Quill.They are around 10cm long and are widespread throughout tropical regions in the Indo-Pacific.But the picture attracted hundreds of comments on Facebook by many who had their own theories.One said: "Sea Pen...is?"Another wrote: "Reminds me of a guy I knew once."One man said: "Where do the batteries go?"A fourth joked: "Aaaahhh yes, the Mighty Sea Pen.
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