The Creature Mod was a Minecraft mod made by dsm1891 on The Creature Hub forums.
The mod added more mobs to Minecraft, these mobs included Seamus, Kootra and Nova. These mobs spawn in any Minecraft biome. Later the creator made the other 7 Creatures (at the time) and made evil counterparts for each of them, which only spawn in the Nether. It says on the forum post of this mod that a rare Nova mob spawns which you can in fact ride. The Creature mod soon became inactive. It made a return in 2012 by a different person but no Creature found it and yet again had stopped at V 4.7.