Leaf sea dragon

Yes, you are looking at a Sea Dragon, perhaps nature's best example of camouflage. It looks like a plant, but it's a sea horse. This one is upside down--or at least his snout is on the bottom right, and his tail is on the top left. In all, it's about ten inches from end to end. It's one of the most amazing creatures I've seen. It's an example of the incredible diversity of life on this planet.

"Leafy Sea Dragon" by @argentplume

This was a lucky save. The shot was overexposed, and there were lots of reflections on the tank. Darkening using curves resolved both issues, and brought out the UV lighting colors as well. The larger size has more detail.

A leafy visitor in Rapid Bay

Sea Dragon - Unbelievable floating colorful specters of the sea. The male takes care of the eggs.

Yes, dragons of the sea are real ... and they're masters of disguise

Perinereis nuntia (aka voted most beautiful worm) by Alexander Semenov underwater photography. Find his work on Flickr, too. Idea: pieced and applique quilting.