Sil's Species

Species are an unnamed, sexually aggressive alien species intent on spreading itself throughout The Universe by infiltrating, breeding with, and annihilating the intelligent populations of other planets. It is capable of rapid growth and can bond its own DNA to that of other creatures through sex and other forms of genetic contact.

Origins
Professor Herman Cromwell claims that the original species originated in the Large Magellanic Cloud (called the Magellanic Galaxy). The only other place in The Universe where Carbon-based life had apparently been discovered. It is also stipulated that they were a "cancerous" race that visited Mars millions of years ago when its surface was similar to that of Earth, and annihilated all life on its surface before leaving remnants of their DNA in its soil.

Mankind's first interaction with this particular species occurred in 1994 when the SETI (Search for Extra-Terrestrial Life) project received a pair of messages from outer space. The first message contained a more efficient use of methane, while the second contained a DNA sequence along with directions on how to mix it with Human DNA. As the first message was seen as friendly contact, scientists went ahead and performed the fusion. Three living organisms were created, two of which were put into frozen stasis in liquid nitrogen, while the third (a female) was allowed to grow under the code-name "Sil". Sil was later succeeded by several more generations of the species spanning across 4 films (Species, Species 2, Species 3, and Species the Awakening)

Racial Characteristics & Abilities
The Species appear to be sexually dimorphic with males being much larger than females. Males seem to be quadruped with females having smaller bipedal (humanoid) forms which appear to be far more agile. Both genders of the Species have chitinous, skeletal bodies which are semi-transparent. The mouth has two mandibles similar to that of the Predalien and they possess hair-like tentacles that are similar to the Predator species. The species also has the ability to shape shift between Human and Alien forms as well as a limited ability to morph their alien forms for the purpose of adaptation to given situations. The DNA structure of the species is extremely versatile and is constantly evolving and mutating which in turn gives them incredible regeneration abilities. Most of the members of the species seen are actually mutations from humans, but a pure form is seen in the first film. It takes on the form of a blobby, tentacle monster with a long mouth-like appendage that lashed out at whatever was nearby. The alien grew so fast that it would double in size in a matter of seconds. After a little over two minutes of life, it was killed by immolation. A similar creature is born from a female human astronaut infected by the alien DNA in Species2.

Males: There are only two known examples of the male of the species. In the film Species 2, an American astronaut, Patrick, was infected with the alien DNA while on a mission to mars. When Patrick returned to Earth, the alien DNA that he was infected with soon transformed him into a human-alien hybrid. He then went on a mating spree impregnating human females who would die shortly after giving birth. Toward the end of the film, the Patrick hybrid demonstrated the ability to split his head in two, thus forming a duel headed form. Between his heads emerged a long tentacle which can be used to kill or even impregnate females.

Another male, a short-lived hybrid in Species 3, had an extendable tentacle-penis which attempted to enter a female hybrid’s mouth; similar to the tentacle described above. This suggests that the female species in fact can be impregnated via oral intercourse.

Females:

The female of the species is the most prominent as well as decidedly the most dangerous. The movies reveal numerous generations of the female species, each varying in appearance and abilities. It can be assumed that as the species procreates (whether with humans or other hybrids) it evolves and improves with each generation. However each generation share similar physical characteristics.

1st Generation: Sil

The most prominent hybrid created by the species was "Sil". The alien DNA induced rapid growth, causing Sil to form into a visible fetus in a single day. In less than a month, she grew into a young girl on the verge of puberty. Sil exhibited great speed and strength, but also suffered from terrible nightmares brought on by her alien DNA. She later claimed that the nightmares “Tell me who I am.” Ultimately, the research team decides creating Sil was a mistake and attempted to poison her with gas. Sil escapes the lab in which she was created and, while on the run, pupates by forming a cocoon of maroon-colored flesh similar in appearance to the pure alien form. She was horrified by this development and the process appears to be very painful. After a few hours, she emerged from her cocoon as a fully-grown (and consequently very attractive) woman.

While still somewhat shy and uneasy, Sil is able to quickly adapt to her surroundings, showing an incredible cunning as she blends into society. Sil also demonstrated an incredible ability to assimilate knowledge just by touch. For example, in a few seconds she has the ability to assimilate entire books simply by touch. How this phenomenon works is never explained. Besides speeding up her growth rate, augmenting her intellect/memory retention, and enhancing her physical abilities, the alien DNA also greatly enhances the most basic of animalistic impulses: the need to procreate. Pretty soon, Sil’s alien libido takes over and, in a state of almost constant fertility (she seems to menstruate once), she attempts to mate with Human males.

Her Human form is, in truth, merely a disguise and her true alien form is an exotic, sensual, alien mockery of the Human form. Her form is chitinous and reptilian, somewhat reminiscent of the creatures from the film Alien, but still Humanoid in appearance. Her “hair” is a mass of prehensile tentacles which a re slicked back behind her head. She possesses two sets of teeth with the internal set being razor sharp. Her breasts, rather than storing fat or mammary glands, instead store long, slimy tentacles which emerge from her “nipples.” She can use her breast-tentacles as weapons but they are also used in her mating ritual (as shown in the second film). Sil has long sharp spines up her back that she can retract and extend at will. These seem to be utilized as a weapon in Species 2 by Eve. Last but not least, Sil's infamous tongue. Her long tongue is tipped with sharp spines and is her primary defense mechanism (or weapon). When threatened, she can simple impale her aggressor with her tongue. This "kiss of death" is shown in each of the franchise's films at least once. Sil’s alien form is also capable of holding its breath underwater for an extended period.

thumb||  In the first Species film, Sil eventually successfully mates with the character Arden and she gi ves birth to a son mere hours later. While she is in labor, her abdomen bulges slightly with her rapidly developing child and her chest starts begins to separate. At the moment of birth, Sil's ribcage splits open and separates to reveal her newborn son. Sil's son does not survive for long however and is killed minutes after his birth.

There remains some conjecture as to how Sil's race concieves and what traites are passed on. Due to the changing nature the the species and the diverse variations in subsequent generations, that there is no way of knowing for sure. The main reason however lies with the low success of the Species film franchise as a whole.

2 nd Genration: Eve

Eve was a clone of Sil and was created to be an "improvement." She was designed to be less aggressive and slightly more docile by making her more "human."

Technology
In the movie's Novelization it is mentioned that the signal that came to Earth was transmitted through several Black Holes which served to hide its point of origin.

It is unknown what level of technological achievement "The Species" are currently at, however their mentioned mastery of black holes is a testament to their achievements. In the cannon versions of both movies and their novelizations, the Species have no space travel capabilities, however in a rejected Species II script, a space faring vehicle of some kind belonging to the original Alien race is mentioned. It does seem plausible (although not canon) race advanced enough to manipulate Black holes would also have achieved advanced space travel.

In the second Movie Novelization "Species II". We learn that the species had once established a colony on Mars and consumed all of the planet's natural resources before moving on. It is unknown how they got to Mars and there is no mention of space travel leaving it opens to debate. However, a character speculates that the Species could be literally billions of years old. Their capabilities remain unknown but the human hybrids show an ability to learn and absorb information extremely fast and put that knowledge to practical use.