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List of Earth creatures

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This subject is related to the Black Mesa Incident era.
This subject is related to the Combine era.
This subject is related to the Portal era.
This subject is related to the Portal 2 era.
This subject is related to the Lego Dimensions universe.
This is a safe article. Click for more information.

"Crab" redirects here. You may be looking for Headcrab or Crab Synth.

"Nothing sadder than an empty crab pot."
The Fisherman[src]

Apart from the Xen, Race X and Synth creatures, Antlions or Combine Advisors, the Half-Life and Portal series feature Earth creatures as well. They are either heard, mentioned, or appear as actual NPCs.

Half-Life and its expansions[edit]


Birds can be heard outside of Black Mesa. Sound file names suggest they consist of hawks and quails.


Main article: Penguin

The Capture The Flag mode of Opposing Force features Penguins with grenades strapped to their back. They act like Snarks.


Insects can be heard in the exterior maps and some inside maps. Sound file names suggest they consist of flies, bees, and crickets.


The Cockroach (monster_cockroach) is seen crawling in many places across the Black Mesa Research Facility. His AI was made by Steve Bond.[1] Its health is very low, since walking on it will kill it instantly.


A fly model was originally to appear in Half-Life, but it was ultimately cut, being just heard in the outdoor areas. The texture can be found in the Half-Life: Source files.


Moths are occasionally seen gathering together and flying around light sources.



Rats (monster_rat) can be seen walking slowly and standing on their hind legs in the Black Mesa Hazard Course. There, they do not react to the player's actions, and can only be killed using grenades.

They also appear in Half-Life concept art and early test maps.

Half-Life 2 and its episodes[edit]


With the humans, birds are the only Earth creatures seen during the Combine occupation. No explanation of this particular survival is given in-game. As most NPCs, birds can be killed. Civil Protection officers and Overwatch Snipers can be seen shooting them from time to time, and Xen creatures attack them occasionally as well.

There are three known types of birds in Half-Life 2 and its episodes: the pigeon, the crow and the seagull, although many other types of birds (such as woodpeckers or miscellaneous birds of prey) can be heard in the Outlands. Other unidentified birds (simply named "coast bird" in the sound files) can also be heard along the Coast.


Crows (npc_crow) are found in City 17, Ravenholm and the Outlands. They are sometimes seen feasting on corpses.

During the teleportation mishap in the Half-Life 2 chapter "A Red Letter Day", Gordon is first sent into the Wasteland, which is filled with crows, one of which gets caught in midair by Lamarr. Immediately afterward, when Gordon temporarily reappears in Kleiner's Lab, it appears that a crow came back with him, as one can be seen at his feet.

In the Half-Life 2 chapter Route Kanal, the player can see a crow quickly take off, only to be eaten by a Barnacle. In the chapter Anticitizen One, an unplugged television on a pile of rubble blocking the doorway leading outside shows an image of the G-Man standing in a wooden boat with a crow on his shoulder. A similar surreal scene can be seen in the WC map pack map ickypop, involving the G-Man being held in mid-air by a flying crow.[2]

At White Forest, false alarms are often triggered in the secondary silo by nesting crows.


Although no dove is seen in-game, one is featured on one of the Combine propaganda posters scattered around City 17, above Combine logos, as an ironic symbol of peace. What appears to be a dove is also featured on a beheaded statue seen in Ravenholm's churchyard.


Pigeons (npc_pigeon) are found in the City 17 area and the Canals.


Seagulls (npc_seagull) are found along the Coast and over City 17.

The Fisherman from Lost Coast is very defensive of what remains of Earth's original species. His comments on these species gives the player more knowledge on the effects of Xen lifeforms and the Combine on Earth's natural environment. If the player shoots a seagull, the Fisherman will show he disagrees, saying, in that order and at each seagull killed, "Hey, now! We've lost enough species already!", "What'd that gull ever do to you?", "Don't shoot the gulls! They keep down the leech population!" and finally "Well, suit yourself. I can't stop you.", after which no more seagulls can be seen.

In the Half-Life 2 chapter Highway 17, a seagull can perch on and befoul the Scout Car if Gordon leaves the vehicle unattended for a period of time. The seagull will fly away when the player approaches.

It was by animated by Derek Jenson.[3]



Barnacles (or Cirripedia, not to be mistaken with the Xen Barnacles) can be found on the rocks and the seafloor at the very start of Half-Life 2: Lost Coast.


In Half-Life: Alyx, cockroaches are seen and heard scurrying by Alyx's feet when she walks near their nesting spots.


In Lost Coast, if the player grabs a crab pot with the Gravity Gun, the Fisherman says that most of the crabs have been eaten by Leeches.


Worms can be seen on the chest of the rotting Citizen corpse model.


Insects can be heard but not seen in the Canals, in the Outlands, and along the Coast. Flies can also often be heard near corpses.



The "What Cat"? achievement icon

Although not a single cat is seen in Half-Life 2 and its Episodes, one is mentioned at the start of Half-Life 2: Dr. Kleiner apparently tested his resurrected teleport on a cat, aided by Barney, and the experiment went bad enough to give Barney nightmares about it. When Barney learns the teleport is fixed, he replies "You mean it's working? For real this time? Because... I still have nightmares about that cat." Alyx is puzzled and asks several times "What cat?" but does not receive an answer. Before being teleported, Alyx asks again "About that cat..." but again is not answered. Later in the game, Barney mistakes a distant Strider roar for a cat meow, saying "Did you hear a cat just now? That damn thing haunts me."

An Orange Box Achievement, "What cat?", requires the player to break a mini teleport in Kleiner's Lab.

In the Half-Life 2 leak sound files, an additional line from Barney elaborates further on the fate of the feline, stating "I had to turn the cat right side out again, Gordon, to make sure it was a cat.".

In Half-Life: Alyx, numerous cats be found roaming City 17 during the first chapter of the game, indicating they were relatively common sights. Some can be seen walking through the streets and along rooftops, while others are found sleeping in spots such on the balcony next to Alyx's lookout post. Alyx also briefly glimpses into the apartment of a woman who owns several cats and cat-related knick knacks. Elsewhere, a "Missing Cat" notice is posted in a nearby laundry room.


A bronze horse statue can be seen on a column at the end of the chapter "Follow Freeman!", in the map d3_c17_13. It was originally featured in WC map pack maps such as e3_terminal, c17_assault2, as two horses, each on a column, or in the museum in Palace. It can also be found alone on a column in d4_streetwar_01, the first street map following Palace. The prefab map prefab_government also contains two horse statues.

During the City 17 uprising, a Citizen says he could "eat a horse, hooves and all".


Rats can be heard in deserted or infested areas, such as Ravenholm and the City 17 Underground, but are not seen.

An incomplete rat model can be found in the Half-Life 2 leak files.[4] A video from Valve's 3D artist Derek Jenson demonstrates a fleeing flock of rats, with one of them getting caught and eaten by a Barnacle; the same (and still incomplete) model is used, with animations not present in the leak.[3]

In Half-Life: Alyx, several rats can be seen throughout City 17 and the Quarantine Zone, both dead and alive. Some rats have been absorbed into the Xen Memory Worms used by Combine interfaces.


Along the Coast in the Half-Life 2 leak only, whale sounds can be heard underwater. As seen in the sound files, however, they actually are Ichthyosaur sounds, named "ping1" and "ping2".[4]

The seafloor was originally to be full of beached ships and whale bones,[5] recalling the real world Aral Sea.



Frogs can be heard but not seen in the Canals.

Portal series[edit]


Birds can be heard outside at the very end of Portal. Some birds such as a goose, a crow or a sparrow can also be seen on GLaDOS' screens at the end of Portal.


As seen on a clipboard found in the Enrichment Center in Portal, Test Subject #042 was apparently a chicken that failed the tests it took.

A rooster is among the 9 animals to be chosen from at the start of the Calibration Course of the Cooperative Testing Initiative. All the other animals are mammals.

Portal 2 concept art revealed during the PotatoFoolsDay ARG shows Aperture Science producing and growing giant chickens, and that one of them escaped at some point in administration areas.

A case of the diorama exhibit sequence cut from Portal 2 was to contain at least one life sized statue of a chicken.[6]


In Portal 2, Wheatley is attacked by a crow after stealing her eggs. The same crow then catches PotatOS and puts her in a nest in Test Shaft 09 after pecking her.

In Peer Review, the crow appears to have laid three eggs in an old GLaDOS prototype chassis. At the end of the DLC, ATLAS and P-body enter the chassis room on GLaDOS' order, and drive off the bird. GLaDOS then orders them to smash the eggs, but changes her mind in time. Instead, she places them in a small Relaxation Vault-like box, where the chicks are raised with GLaDOS as their new mother. One day, while she is mocking them about their beaks, the one she called "Mr. Chubby Beak" smashes the glass of the vault, making GLaDOS realize that they are actually "little killing machines". She then asks them to go to sleep, telling them that she has got a "big day" for them the next day.


In Test Chamber 09 in Portal 2, GLaDOS teases Chell about her weight. Upon completion of the test, GLaDOS ironically compliments her: "Look at you. Sailing through the air majestically. Like an eagle. Piloting a blimp."


A fish civilization exists on Earth-5912228339 and Earth-5912228341.[7]



In Portal 2, many insects can be heard in the ruined Enrichment Center. Additionally, some of them can be also found in the Multiverse.


An ant civilization exists on Earth-5912228343.[7]


In a memo by Cave Johnson revealed during the Portal ARG, he states that the "bean counters", a higher authority than himself, told him it was against regulations to practice beekeeping in his office. Johnson ignored this, and his bees' honey won first place in the state finals.


Crickets can be heard outside at the very end of Portal, and are named as such in the captions.


The injection of a praying mantis DNA was the subject of an Experiment made by Aperture Science, eventually leading to creation of Mantis Men. Additionally, mantises are present in 8th and 15th Universe, featured in Perpetual Testing Initiative.

Sea animals[edit]


An octopus civilization exists on Earth-5912228342.[7]


Two depictions of jellyfish can be seen in the maintenance areas of Aperture Science Enrichment Center, both drawn with a pencil on a wall. The Nice Little Jellyfish is located in a small office room overlooking Test Chamber 09 while the Big Bad Jellyfish can be found among abandoned offices, near the first Rocket Turret encountered by Chell.


Some mammals can be seen on GLaDOS' screens at the end of Portal. They include cows, a horse, a black bear cub, a rabbit, goats, sheep, and the skull of a cow.

One animal can be chosen among the nine featured in a table at the start of Portal 2’s Calibration Course of the Cooperative Testing Initiative. The table includes 8 mammals, such as a horse, a deer, an elephant, a wolf, a moose, a baboon, a porcupine, and a rhinoceros.


Cat poster.

In both Portal 2: Lab Rat and Portal 2, there is a running reference to the Schrödinger's cat experiment.

The hub in The Lab features the poster of a cat hanging from an electric wire made for the Aperture Laboratories Shock Outreach Initiative to remind staff to be wary of electrostatic discharge, with the words "Don't hang in there! Ground yourself".


In Portal 2, GLaDOS mentions to Chell and ATLAS and P-body that she sometimes sees deer outside the facility. She then attempts to lure Chell into the "trap" chamber during her escape, telling her a deer can be found there.

A deer is among the 9 animals to be chosen from at the start of Portal 2’s Calibration Course of the Cooperative Testing Initiative.


In Test Shaft 09, Cave Johnson states in one of his pre-recorded messages that the Enrichment Spheres are made out of asbestos to keep out the rats.


The mural with the howling wolf.

A howling wolf can be seen replacing the person on the beach in the mural featured in Chell's room in the Extended Relaxation Center.

A wolf is among the 9 animals to be chosen from at the start of Portal 2’s Calibration Course of the Cooperative Testing Initiative.


Form 21 of the Enrichment Center Test Subject Application Process found on contains a list of 1345 items mostly consisting of animals, taken from an index found at the website AnimalPicturesArchives.

List of appearances[edit]

Main games[edit]