As another way to blend in, from this female Hippocampus seahorse photo by LaTonia Hohweiler you can see how some seahorses grow filamentous skin extensions.

Like this female Hippocampus seahorse has, some seahorses grow filament-like extensions from their skin as another way to better hide from predators.
Photo by LaTonia Hohweiler
Interesting Seahorse Fact: Seahorses are masters of camouflage. To disguise themselves they not only can change their colors and markings at will to perfectly match their surroundings, but some seahorses like this female Hippocampus seahorse can grow filamentous extensions from the skin.