The cloud cover on planet Opac is so dense and consistent that the sun only shines once every three-hundred years. There is a large scar across the face of the planet. Presumably it is the impact that made this scar that shifted the planets axis from a horizontal to one perpendicular to the planets orbit around its sun. The planet has a lighter side and a darker side at all times. It has little seasonal change. The only light and warmth on the dark side of the planet is volcanic. All life on the dark side of the planet either feeds off of the light side or derives its energy from bacteria that thrive on the sulfur or methane released by volcanic activity. However, even on the light side of the planet, because the clouds so heavily diminish the amount of light, life is in chronically intense competition for energy.
Even the small forest in the tropical zone lacks the abundance of life that similar regions on earth usually support. These forest are dominated by bulbous blue plants. The plants are blue because they specialize in collecting infrared light for their energy. Every three hundred years, these trees absorb as much of the suns heat as possible. Other plants tend to be green or red as higher frequency light is far more likely to penetrate the thick atmosphere of planet Opac.
It is in these forests, which feast on dim or rare sources of light, that the batskinks make their home. The batskinks are intelligent but primitive. They have small wings that allow them to glide short distances and they fortify their tree top homes with entrances that are difficult to enter without some small flight ability. Most of their intelligence is applied to elaborate mating rituals, which have resulted in a great diversity in vibrant belly patterns. However, a recent threat is forcing the batskinks to think more and more about weapons.
The dark side of the planet is filled with elite predators. The factors that help predators become successful are not very different than those factors which greatly determine the success of earth’s greatest predators: specialized sensory receptors, stealth, energy conservation, speed, and of course intelligence.
The atmosphere on planet Opac is very highly charged. There is almost constant horizontal lightning which cycles in one direction across the planet’s surface and in another direction through the planet’s cloud cover. Many predators use the ions in the air to help them detect electrical changes caused by potential prey, much as sharks do in the oceans of the earth, hammerheads even more successfully than others. Smell and vision also play a vital role in determining the success of predators. There is far more bio-luminescence on the surface of Opac’s dark-side than there is anywhere on earth’s surface. In order to escape the keen eyesight of dark-side predators, creatures have evolved elaborate decoy mechanisms and hypnotizing patterns. Creatures with bio-luminescent capabilities also find safety in numbers. The largest herds on the dark-side of the planet are herds of bio-luminescent rabbit lions. These creatures are shaped something like rabbits with large ears, long tails, huge eyes, and razor sharp fangs and claws. They breed in super herds but attack in small packs that use synchronized patterns of light to confuse prey.
Even such effective predators as these have enemies, though. Rabbit lions are the favorite food of shadow foxes. These creatures are almost more like snakes or crocodiles than like foxes. They are incredibly long and have massive jaws. They can consume a meal over twice their size and digest the meal for months at a time. What they may lack in speed they make up in stealth, energy conservation, and intelligence.
The rabbit lions have migrated further from volcanic zones in order to track some of their favorite choices in prey. The have ventured into a mountainous region that is simply too cold for shadow foxes to follow, as shadow foxes lack fur in order to allow for color changing skin. Rabbit lions on the other hand, receive their bio-luminescence from bacteria that live in the hollow bristles of their thick fur. The shadow foxes have begun to venture further and further into the tropical forests, home to the batskinks.
Although shadow foxes’ cloaking ability is less effective on the light side of the planet, batskinks do not have the greatest eyesight and are vulnerable to shadow fox ambushes. The only thing keeping the batskinks from going extinct is that they possess more dexterous appendages than their aggressors do. They have collected branches and vines and made long feelers for themselves in order to detect shadow foxes before landing on any particular branch. The have also constructed daggers out of the massive thorns that surround the stems of snaggle clamp lilies, a carnivorous plant that grows up out of bodies of water onto the marshlands near the edge of the forests. Large as shadow fox jaws may be, their noses are quite vulnerable to dagger thrusts. With eyes suited only for darkness, a shadow fox without use of its nose becomes a very poor hunter. As shadow foxes are able to survive without food for long periods of time, they have developed a low tolerance for pain, unless truly near starvation.
The shadow foxes determined to loose their prey from treetop barricades, have resorted to deforestation. They use explosive rocks found adjacent to volcanic metal deposits. They insert the rocks into tooth made gashes in the trees then fling rocks at the gash from a safe distance until an explosion occurs, occasionally toppling a tree filled with batskinks and batskink babies, a very tasty meal, even for a full grown shadow fox.
Luckily for the batskinks, the rabbit lions have started to return to usual hunting grounds. The shadow foxes will soon retire to the darkness. These species will continue to evolve independently. They will only make contact three or four times until they have grown into complete civilizations. At this point they will go to war. Eventually, after millenia of conflict, they will make peace and turn to science. Through joint effort they will travel the stars until they reach planet earth.