Here's the colored version! Done with Crayola and Prismacolor pencils.

Ecological bio:
These seafaring mammals live on green things like kelp and turtle grass, supplementing their diet with corals and other crunchy stuff to get their minerals. Thus, they need to stay reasonably close to shore to access these light-dependent organisms. However, they are migratory (moving from feeding to breeding grounds and vice versa), so during the yearly migrations they will make use of open ocean currents, stopping nightly for food and rest. Even so, they are practically starving when they arrive at their destination, and the first thing they do is bulk up on food. They will also flee to deeper water if assailed near shore, and vice versa if attacked in open water. If cornered, they can headbutt attackers with their horn-ridged heads or lash out with their forelimbs (all fins folded up, or "fisted").

Breeding season is hailed by a bit of a color change. Normally the horn ridges on the head are about the same color as the body (males) or mane (females); however, during breeding seasons the males' ridges become a bright pink (as shown), while the females sport a deep yellow-orange. Otherwise it is nearly impossible to tell the sexes apart without resorting to procedures the hippocamus would not like in the least.