No idea why but I decided to search how many aliens there are in the Xenomorph species.......

There are many many kinds.

Xenomorph: The Xenomorph XX121, better known just as Xenomorph (which literally translates to "alien form") or the Alien, are an extraterrestrial, endoparasitoid species with multiple life cycles, possibly originating from the planet Proteus (also known as Xenomorph Prime). One of the deadliest of all known alien species, these creatures need a host organism in order to reproduce. The appearance of the Xenomorph varies depending on its host. The human phenotype is generally around 7–8 feet, and roughly 136.0 to 181.4 kilograms in weight, with a long, muscular tail and large, curved, oblong head.

They are very vicious, attacking anything that isn't a type of Xenomorph. They eat meat and can have a habitat anywhere.

Facehugger: The facehugger is a parasitoid; its only purpose is to make contact with the host's mouth for the implantation process, by gripping its long, bony finger-like legs around the victim's head and wrapping its tail around the host's neck, then slowly tightening the tail in order to make the host gasp for oxygen and be rendered unconscious. By this point, the facehugger will have inserted a tube-like proboscis into the mouth and down the throat of the host, supplying the host with oxygen while implanting an embryo. Attempts to remove facehuggers generally prove fatal.

Queen: Queens are much larger than Drones and Warriors. They stand approximately twenty feet tall at the hip. They have twin sets of arms and are built more similarly to a large theropod dinosaur than a humanoid. They also have a much larger braincase than the average adult Xenomorph, protected by a large crest above their heads. They also have a slightly stronger tail, which can be used as a weapon, along with their limbs and inner jaw, as shown in the climactic battle with Ripley in Aliens. Due to their immense size, they are extremely strong.

Predalien: A "predalien's" typical appearance and behavior is similar to the typical human-spawned Xenomorphs, albeit with the telltale hair-like appendages and mandibles of a Predator. They are extremely deadly, and can use their sharp tail to dice someone into pieces. Their methods of attacking prey, however, are similar to those of a wolf or a lion: they circle around their intended victim, growl, then snap them up

There are still 60 more species........ Gotta love Xenomorphs.