Sue Hollis , Blue Organ Pipes (January Theme: Blue)

Organ Pipes are found in groups of 22 or more sponges and can take on some brilliant colours depending on how much light they are in. They are some of the strangest, most captivating animals in our oceans. Often confused for plants or rocks, these immobile invertebrates lack not only a spine, but a heart, brain, digestive system, respiratory system, and pretty much any organ that is similar to a human's. Although they have been used by humans for cleaning, these days they are free to filter the water around them as nature intended.

Images have been resized for web display, which may cause some loss of image quality. Note: Original high-resolution images are used for judging.