What is NOT a popular image of aliens?

When considering popular images of aliens or extraterrestrial beings in science fiction and popular culture, a few classic archetypes often come to mind, such as:

1. The "Little Green Men": Small humanoid figures with green skin.
2. The "Grey Aliens": Usually depicted as having grey skin, large heads, and big black eyes. These are the types often associated with UFO sightings and abduction stories.
3. The "Nordic Aliens": Human-like in appearance with fair skin, tall stature, and usually described as having blond hair and blue eyes.
4. The "Reptilians": Aliens depicted with reptilian features and said to have scales, often portrayed as having a human-like form but with a more sinister demeanor.
5. The "Insectoids": Insect-like aliens, sometimes referred to as the "praying mantis" types, for their resemblance to terrestrial insects, particularly the mantis.
6. The "Robotic" or "Mechanical" Aliens: Extraterrestrials that are entirely mechanical or cybernetic.

On the other hand, an image of aliens that is NOT as popular or commonly depicted might include more ordinary or mundane forms, such as:

1. Aliens that look indistinguishable from modern-day humans.
2. Aliens resembling Earth animals exactly or with only minor changes.
3. Aliens with shapes that adhere strictly to known Earthly biological forms without any novel or unusual characteristics.

Keep in mind that "popularity" can be subjective and fluid; what is not popular today might become the central image in the next big science fiction hit tomorrow. Furthermore, many works of science fiction strive to come up with unique and innovative depictions of alien life that challenge the norms of popular culture.