One of the best alien species in fiction is the Vulcans from 'Star Trek'. They are known for their logical thinking and unique culture. Their pointed ears and green blood make them distinct. Another great one is the Na'vi from 'Avatar'. They have a deep connection with their planet Pandora and their blue - skinned, large - eyed appearance is very striking. Also, the Daleks from 'Doctor Who' are quite memorable. They are robotic - like aliens with a strong desire for conquest and a distinct 'Exterminate!' catchphrase.
The Xenomorphs from the 'Alien' franchise are among the top. Their terrifying appearance, with the elongated head and acid - for - blood, makes them iconic. Then there are the Klingons from 'Star Trek'. They are a warrior race, with their own honor code and a very rough and tough look. Yoda's species from 'Star Trek' is also interesting. Although not much is known about their home planet or culture, Yoda himself shows great wisdom and unique Force - using abilities.
The Martians from H.G. Wells' 'The War of the Worlds' are classic. They are highly intelligent but also very menacing as they invade Earth. The Ewoks from 'Star Wars' are cute yet fierce little aliens. They live on the forest moon of Endor and use primitive but effective weapons. And the Asari from 'Mass Effect' are a very alluring alien species. They are a long - lived, mono - gendered race that is very diplomatic and has a strong connection to biotics.
One of the best ancient alien species in fiction is the Goa'uld from 'Stargate SG - 1'. They were powerful and had a complex hierarchical society. They could possess human hosts, which added a lot of intrigue to the story.
The Xenomorph was the fictional alien species featured in the movie Alien. It's that creepy, acid-blooded creature.
The Wookies from 'Star Wars' are really cool. They are big, furry and very strong. Chewbacca is a well - known Wookie and he is a loyal friend and great co - pilot. The Transformers, which can be considered as a kind of alien species, are amazing. They can transform from robots to vehicles and have their own complex society and war. The Silurians from 'Doctor Who' are an ancient reptilian alien species that has a very different view of the world compared to humans.
Well, they are often depicted as having a menacing appearance. For example, they might have sharp teeth, large claws, and strange, glowing eyes. Their motives are usually about conquest, like taking over Earth for its resources. They also tend to have advanced, but cruel technology, such as weapons that can cause mass destruction.
I think 'Foundation' series by Isaac Asimov also counts. Although not strictly about 'alien species' in the traditional sense, it deals with different galactic civilizations which can be seen as alien to each other. It's a classic of science - fiction literature.
One common motive is conquest. They want to take over planets, including Earth, for resources or to expand their territory.
Alien species in science fiction are frequently designed to contrast with human values and cultures. Their social structures can be vastly different. For instance, they could have a hive - mind where individuals have no concept of self - identity as we do. Their technology might be based on principles that are alien to us, like using biological functions for energy production instead of mechanical means. Appearance - wise, they may be inspired by real - life organisms but exaggerated to an extreme. For example, an alien might look like a giant insect with wings that can generate electromagnetic fields for communication. These depictions not only fuel our imagination but also make us reflect on our own humanity and place in the universe.
Well, a lot of science fiction depicts alien species in relation to our own fears and desires. For example, some million alien species might be shown as extremely aggressive, representing our fear of the unknown. On the other hand, some are presented as highly intelligent and benevolent, which could be a projection of our hope for something better out there in the universe.
The Martians from H.G. Wells' 'The War of the Worlds' are an old - fashioned but still interesting ancient alien species. Their use of tripods and heat - rays to attack Earth was a very imaginative concept for the time. They were a terrifying and powerful force, showing how vulnerable humanity can be to an alien invasion.
It varies. While many science fiction works do capitalize alien species names for the sake of clarity and to give them the status of proper names, some may not. In some cases, if the alien species is being referred to in a more general or descriptive way, the name might not be capitalized. However, as a general convention, capitalization is the norm.