Unnamed non-humanoids (24th century)
The following is a list of unidentified non-humanoid species observed in the 24th century.

Alien lifeform 
 
An alien lifeform was seen on a viewscreen depicting data from the 's library computer. ()

Ba'ku animals

Dark matter nebula planet animal 
On the coastal regions of this planet, cries of this unseen animal could be heard in the background. ()

Desert planet predator  

While stranded on a desert planet in 2381, Ensigns Bradward Boimler and Beckett Mariner were charged by a large animal whose body was impervious to phaser fire. Mariner and Boimler were able to shelter themselves from the creature inside the shuttlecraft Yosemite, though it devoured their emergency rations. ()

Ferenginar creatures 

Two statues depicting animals could be seen in Ishka's home on Ferenginar. ()

Foot-eating creature 

This creature seemed to feed on the feet of Humanoids.

Before Doctor T'Ana cut off her patient's foot with a chainsaw, the the foot-eating creature had already digested his toes. ()

Footprint and cell sample aliens 
Footprints and corresponding cell samples of several species were stored in the library computer of the Enterprise-D. Samples of at least five alien species were compared to the footprints and  sample of the Tarchanne prior to its discovery. None of the samples was similar to the Tarchannen III lifeform however. ()

Goralis III animals 

While stranded on Goralis III in 2375, Worf killed a large furry mammal, somewhat similar to a wolf, for food. Worf also mentioned the planet having predators that might pose a threat to him. ()

Horned creature 

The stylized image of a possibly reptilian or  creature with a unicorn-like horn could be seen on an Alpha Quadrant terrorist communicator and as a badge in use by two Delta Quadrant species, the Mari and the Ledosians. (; )

Hysperian dragon  
The planet Hysperia was home to creatures resembling dragons from Earth mythology, which some Hysperians kept as pets. One such creature was also present on Queen Paolana's cruiser, the Monaveen ()

Larval space creature  

At some point in time, this larval spaceborne species was encountered by the , and attached itself to the end of the ship's port nacelle. ()

Moon creature 
A Delta Quadrant Mikhal Traveler claimed to have landed on a moon only to have discovered (after sustained moonquakes) that it was actually a creature, a living being so massive it generated its own gravitational field and so immense that it supported its own ecosystem. Another traveler, who had visited the system in 2373, expressed skepticism, as his sensors had not picked up anything like that. ()

New Earth primate 

The New Earth primate was an intelligent - but non-sentient - primate species native to the planet called "New Earth." 

Kathryn Janeway attempted to communicate with the primate during her brief stay on the planet in 2372, claiming she sensed intelligence in it. However, Chakotay doubted it could be domesticated. ()

Non-corporeal species

Rigel IV aliens 

These aliens, encountered on Rigel IV, were displayed on viewscreens depicting data from the Enterprise-D library computer. ()

Ruah IV species 
Several animal species lived on the landmass of  the planet Ruah IV as of 2369. ()

Slug-like creature 
While performing anomaly consolidation duty aboard the Cerritos in 2381, Ensign D'Vana Tendi accidentally knocked over a storage canister, releasing a large, gelatinous slug-like creature which promptly devoured her. Although Ensigns Beckett Mariner and Samanthan Rutherford managed to save their crew member and shrink the creature with a hypospray injection, Tendi was still quite traumatized from the ordeal. ()

Slug-o-Cola slug 
The labels on Slug-o-Cola bottles featured an image of an apparently man-sized, slug-like tentacled creature, gorging on the cola. ()

Soukara lizard 

The Soukaran iguana was a type of lizard native to the jungles of the planet Soukara. ()

Soukara mating creatures 
These two creatures made mating calls to each other as Jadzia Dax and Worf traversed the jungles of Soukara in 2374. Upon hearing them howl together after calling and responding, Dax mused, "Another happy couple." ()

Trophy skulls 

Several skulls, which appeared non-humanoid, were in evidence on a Hirogen trophy wall in 2374. ()

A large skull was hanging in a net aboard a Hirogen ship in 2374. It was from a lifeform which was previously hunted down by the Hirogen. ()

 Unnamed non-humanoids (24th century)
Non-humanoids (24th century)