Like all other cephalopods, squid will only mate once in their life. These two are in the middle of a courtship.
The peacock mantis shrimp packs quite a punch. A voracious predator, they will club the shells of crabs and clams until they can get at the soft bodies underneath. Their crushing arms can snap with the acceleration of a 22 caliber bullet.
Sea stars creep along the seafloor using hundreds of little tube feet. These tube feet function through a water vascular system that extends and retracts the feet using hydraulic forces.
Some nudibranchs, like the one pictured here, steal the defenses of their prey. While eating an anemone the nudibranch stores the stinging cells in special pouches. Upon being threatened by a predator they shoot the stolen cells.
The toxic reef crab (also known as the devil reef crab) is aptly named. This crab's muscles store two of the most lethal toxins— tetrodotoxin and saxitoxin. These gorgeous crabs are easy on the eyes but be sure to avoid them on the dinner plate....
Off the coast of England and France the Periclimenes sagittifer shrimp lives in the tentacles of the snakelocks anemone. But the shrimp may be an unwanted guest—the shrimp have been observed nibbling on the tips of the anemone's tentacles.
These two mandarin fish are participating in a courtship dance. Just after sunset females gather to watch males perform a flashy dance. If the female likes a male she will join him by resting on his pelvic fin and as they float above the reef they...
The sponge on this crab's back is more than a stylish accessory. The sponges are great camouflage with the added benefit of toxins and chemicals that deter predators.
When you look underwater, what is making the seagrass wave in the water? The answer is ocean currents . Ocean currents are continuous movements of water in the ocean that follow set paths, kind of like rivers in the ocean. They can be at the water's...
Seahorses are hitchhikers. They can travel long distances across the ocean—farther than they can swim—by attaching themselves to floating seaweed and debris. Read 10 more facts you never knew about seahorses .