Sponges are fantastic underwater animals, bringing vibrant colour to the seabed. The yellow tube sponge is yellow-orange, and forms columns with a hole at the top, resembling chimneys. These "chimneys" can grow up to 10cm high. It is common to find several "chimneys" together, fused at the bottom forming a colony.
Yellow tube sponges can be found on rocks close to the shore. Symbiotic algae, which live inside of them, provide them with essential mineral salts. These alga need the sun light to live, and therefore the yellow tube sponges are always found at depths not larger than 10-15m. As the rest of the sponges, they have no mouth, but feed by pumping water through the holes on the sides of the "chimneys" to the hole on the top top to filter food.