But bizarre traits do not make them into the transitional forms Darwinian evolution desperately needs, or into any other types of in-betweens.
Just like the seahorse, the ruby seadragon (Phyllopteryx dewysea) is a fish. It lives in deep waters off the west coast of Australia and is rarely seen.
Now, however, scientists have filmed it in action 55 metres below the surface.
Unlike some other sea creatures, they have no need of camouflage:
“Instead, their colour helps them hide. Red is the first colour seawater absorbs from sunlight, so at that depth, no red light will bounce off these seadragons, making it hard for predators to see them,” New Scientist explains.