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Item #: SCP-3787
Object Class: Archon
Site Responsible: USWIMC Site-82
Director: Imogen Metcalfe
Research Head: Elliot Alces
Assigned Task Force: Pi-5
Level 3/3787

Threat Level: Red

Foundation Containment Committee Notice

As the anomaly associated with SCP-3787 continues to change over time, its documentation appears here in chronological order. All observed changes to the properties of this anomaly will appear as addenda materials. Only the most recent version of this anomaly's containment procedures are viable.

The original 2021/06/30 documentation is as follows.

Special Containment Procedures [OUTDATED]: To ensure that horse breeding continues as a controlled element and to avoid further progression of the anomaly, Foundation personnel within the Zoology Department are to infiltrate various tiers of the North American horse industry.

Analysts are to track domesticated horse populations for anomalous effects such as uncharacteristic or unprovoked aggression, deviance from feeding habits, and deviance from natural breeding cycles. As personnel cannot quantify the exact numbers of feral horse populations, known populations are to be monitored for abnormal behaviour.

To ensure no deviance to the well-being of baseline horse populations, personnel are to avoid sterilization efforts of current horse populations in an attempt to slow down birth rates and overpopulation. Instead, hormonal agent 762988-16-7 is to be dispersed among horse populations. 762988-16-7 targets horse endocrine systems to promote docility and extend breeding cycles.

Due to the nature of SCP-3787-ε as a widespread anomaly, there are no known methods of containment. Containment initiatives are being accepted by the Site-82 Command Office. Keter-class remains the classification of this anomaly until such a point that acceptable levels of containment have been met.

Description: SCP-3787 describes a deviance to the natural behaviour of domesticated and free-roaming horse (Equus ferus caballus) populations. Personnel have observed this deviance in the Southern and Southwestern United States, though horse populations within the entirety of the US and Canada are potential vectors for this anomaly.

SCP-3787-A refers to the emergence of a gestation period 8 to 10 times more rapid than the baseline horse breeding cycle. The baseline gestation period of 11 to 12 months is shortened to a roughly 30 to 45 day period from conception to birth among horses affected by SCP-3787-A. Up to 10 times as many foals are born as a result. Growth rates of this size over an extended period of time are unsustainable and pose a serious risk to the horse industry's ability to maintain it.

Horses involved in this breeding cycle, including both newborn foals and pregnant mares, are not negatively affected by this accelerated gestation period. Newborn foals exhibit physiological properties similar in nature to their non-anomalous counterparts. They develop within pregnant mares despite lacking the necessary sustenance over the accelerated developmental period.

SCP-3787-B describes an anomalous increase in horse aggression in free-roam horse populations. Personnel have observed SCP-3787-B in the mustang populations of Nevada, where the largest feral horse population in North America exists. Examples of aggression include unprovoked hostilities toward horses outside a constituent pack, the active killing of most or all members of a feral horse pack by that pack's dominant stallion, and in some cases, the cannibalization of foals as a show of dominance.1

Increase in horse hostility has extended into normal horse feeding patterns as well. Feral horse packs affected by this anomaly will carry out organized attacks on other wildlife, escalating to the point of ignoring herbivorous feeding habits. This occurs despite horse jaw structures and digestive systems being biologically unsuited for meat consumption. This manner of aggression has led to the progression of horses to the top of the food chain in many areas.

SCP-3787-B initially began in newborn foals affected by SCP-3787-A but has since transferred to an unknown number of horse populations of varying ages based on a geometric infection model. As well, this anomaly has developed in the same time frame and area as a second equine anomaly, designated SCP-3787-ε. This anomaly refers to the immediate consequences of a marked increase of total horse populations, which has led to the increase of the equine in the human consciousness.

SCP-3787-ε is the designation given to an anomalous memetic form of equinophobia, or the emergence of an intense fear of horses among humans with no previous basis to fear horses. Individuals may not be aware that they have been affected by this anomaly until they have been re-exposed to the concept of horses through forms of media, or through personal conversations that reference horses.

SCP-3787-ε occurs in suburban areas and urban centres, and among populations far from rural communities. More specifically, SCP-3787-ε occurs among populations with little access to that which is equine in nature.2 Individuals within these populations with a fascination for horses on any level are not affected by this anomaly. An estimated 350,000 individuals within the continental United States alone have contracted this anomaly.

Addendum 3787.1


On June 30, 2021, Foundation efforts to reduce the heightened equine birth rate were deemed successful. The median horse gestation period levelled out to approximately 1.5 times the baseline. In the two months since the detection of the anomaly, approximately 450,000 new horses were born in the United States alone.

On July 12, Zoology Department personnel observed what they hypothesized to be an anomalous illness spreading throughout domesticated horse populations. Horses affected by this illness experienced a period of extreme stress, leaving them in a comatose state. In 18% of cases, affected horses later expired. 37% of horses in the Southern and Southwestern United States have been afflicted with this illness.

Research efforts into a cure for this illness have, as of July 29, proven ineffective.

Addendum 3787.2


Since July 12, the accelerated spread of this illness has led to the death of approximately 1.1 million horses in the US alone. On August 10, Site-82, in conjunction with the Scientific Department, published a report on PROJECT: DIRE HORSE to SCiPNET. A summary of the report is as follows.

Addendum 3787.3


On September 3 at 01:04 AM, unknown anomalous entities attempted to force access into Site-41 before being repelled by automated lockdown procedures. A transcript of the encounter, as recorded by on-site surveillance, is as follows.

Addendum 3787.4


On September 5, individuals affected by SCP-3787-ε experienced a spontaneous shift in anatomy, becoming more equine in nature. Not all affected individuals were able to make a full transformation,6 with some expiring before the full transformation became possible. Individuals undergoing this transformation have designated SCP-3787-ε-1.

As well, Foundation personnel specializing in antimemetics training have begun to make note of large numbers of SCP-3787-n. These entities have begun to appear en masse as a direct result of extended Foundation efforts to control North American horse population numbers.7

A full description of SCP-3787-n is as follows.

Containment analysts at Site-82 have come to understand a complex relationship between the appearance of SCP-3787-n and the previous equine anomalies. Analysts have concluded that the emergence of increased equine aggression and accelerated birth rates was in part a widespread anomalous defense mechanism tailored towards the repulsion of SCP-3787-n. However, recent reports have shown that this behaviour has almost reversed, in due part of the influence of SCP-3787-n entities.

The latest development has prompted the reclassification of SCP-3787 to an Archon-class anomaly.8 The Foundation is now undergoing wide-scale internal research efforts focused on the anomalous nature of the equine as a species.

Since the appearance of SCP-3787-n as a collective, North American horses have begun to deviate from their normal behaviour.9 Almost all horse populations have begun to display SCP-3787-B and attack humans, leading to civilian casualties beyond Foundation control. In areas with a high volume of SCP-3787-ε-1 instances, SCP-3787-ε-1 as a population10 has begun to form large groups despite pre-existing human class structures. These groups have begun a mass pilgrimage to a yet undesignated area in the American Southwest, being lead by groups of SCP-3787-n. How the two groups communicate is currently under active investigation.

Various North American equine anomalies have begun acting in an anomalous manner that deviates from their documented behaviour. Equine anomalies seem to have taken an adversarial position on humanity as a whole and are acting in the best interests of SCP-3787-n populations. A full list of the changes to these anomalies is as follows.

Equine Anomaly Documented Behaviour Behaviour Post-SCP-3787 Emergence
SCP-042 A wounded sapient horse that spreads a sense of euphoria after making physical contact. The horse destroys most forms of vegetation it makes contact with by dehydrating them. SCP-042 manifested a wingspan approximately 15 meters in width, which it used to breach containment by flying over the fence of its enclosure. Contact with SCP-042 was lost for approximately 3 hours as it entered a high altitude. Contact was remade when Foundation personnel became aware of reports of a flying horse above Sedalia, Missouri. When personnel arrived, almost all the city's 21,000 citizens had been afflicted with "horse fever", which made them believe they were horses. The use of amnestics has not been able to reverse the effects of "horse fever".
SCP-1556 A group of 15 mustangs that manifests during foggy conditions in the American Midwest. SCP-1556 manifested in downtown Houston, Texas, after a dense fog and gale force winds were reported. The horses displayed hostility, engaging in attacks against civilians for approximately 16 hours. Attacked civilians were later reported to behave in an equine manner and were later designated as instances of SCP-3787-ε-1. It is estimated that over 3,400 civilians have been affected by this anomaly.
SCP-2514 A horse that sings a modified version of "Happy Birthday to You" at a high volume, instilling joyful memories into anyone that listens, while emitting pyrotechnics. The Director of Area-12 found SCP-2514 out of containment and inside his office. After following the Director around for the next 12 hours and causing damage to its surroundings with pyrotechnics, SCP-2514 de-manifested.

The next day, SCP-2514 re-manifested within Site-17 and turned all human-produced food within 1 kilometre of Site-17 into horse feed, while following around any personnel with a birthday. Site-17 personnel were advised not to consume the horse feed. All food shipped to Site-17 within the next 36 hours was also rendered as horse feed. After 72 hours, personnel attempting to consume the horse feed fell into a comatose state and emitted equine vocalizations.
SCP-3996 An intangible feral horse pack that manifests within the Nevada Great Basin desert every 12 hours. Individuals that choose to ride on the horse pack during this manifestation are brought to a tangent dimension with a high Hume level. SCP-3996 manifested in a normal manner. Agent Emile, upon mounting one of the manifested horses, expected to be brought to the tangential frontier of SCP-3996-1. Instead, Agent Emile was taken to the origin place of SCP-3787-n instances.11

As of the creation of this document, the equine anomalies have yet to be re-contained.

SCP-3787-n have directed efforts toward creating an equine ethnostate composed of both horses and SCP-3787-ε-1 populations. Contact with passing equine populations by any non-equine populations has led to confrontative behaviour by SCP-3787-n to protect equine populations. Foundation personnel attempting to hinder the effects of SCP-3787 also face aggression by SCP-3787-n, and in some cases become transformed into horses by unknown means.

Addendum 3787.5


MTF-Pi-5 ("Glue Factory") has been formed to repel the attacks of SCP-3787-n. Each member of MTF-Pi-5 is trained to deal with antimemetic anomalies and are to remain on a strict Class-W mnestic prescription. A summary of the task force's equipment is as follows:

  • 40 combat operatives using light-based weaponry such as the 1000W N-62A Laser Optics Pistol, the 2000W G1A Tactical Solid-state Laser Rifle, and the prototype 30,000W Basok-Prokhorov RX-7Z Hard Light Heavy Rifle ("Nulltaker").
  • 4000 lm flashlights and interfaces with night vision and blue-light eye protection lenses.
  • 15 Polaris MV800 ATV medium support vehicles outfitted with Light Reconnaissance Laser Optics (LaLo) gun platforms.
  • 10 Chenoweth RAV light action support vehicles
  • 4 SL/SX Support Drones with Mariotte-Pashler antimemetic perception filters.

Despite the formation of MTF-Pi-5, the full containment of SCP-3787-n and any related anomalies is not believed to be possible due to their widespread nature. Foundation efforts are directed towards reducing any public fear of SCP-3787-n.

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