Science
These ‘Immobile’ Sea Sponges Apparently Had Places to Go – Gizmodo Australia
With their rigid structures and lack of appendages, sponges can seem more like plants or fungi than the animals that they are. Long assumed to be basically immobile,…

With their rigid structures and lack of appendages, sponges can seem more like plants or fungi than the animals that they are. Long assumed to be basically immobile, sponges have been spotted leaving trails on the Arctic ocean floor, evidence they have more going on than scientists previously thought.
The trails are made of the sponges spicules the hard bits of the sponge that protect its softer tissues and provide the creatures structure. Spicules are generally spiky and can look just like jacks…
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