The Bestiary
23 reported entity types across the close-encounter literature — phenomenology and the skeptical reading, side by side.
Airship Occupants (1896-97)
Ordinary-looking, fully human men — bearded, well-dressed, often multilingual — who identified themselves as inventors testing a secret flying machine of entirely terrestrial origin. Unlike every later occupant type, witnesses described casual, friendly conversation, requests for water or spare parts, and no paralysis, telepathy, or missing time.
Amicizia Confederation Humanoids
Reported as fully human in appearance — tall, calm, well-spoken figures indistinguishable from ordinary people at a glance, in the Nordic contactee tradition — but elaborated across decades into named individuals with ranks, a home-world diplomatic hierarchy, and a stated mission of quietly guiding Earth toward membership in a benevolent interplanetary confederation.
Chupacabra
Described in two competing forms: an early-1990s reptilian biped (roughly 1 m, spines down the back, glowing red eyes, kangaroo-like hind legs) and a later, more common canine/coyote-like quadruped form with patchy or absent hair, protruding ribs, and elongated fangs. Both forms are tied almost exclusively to livestock kills — goats, chickens, and rabbits found drained of blood through small, precise puncture wounds rather than the torn wounds of a natural predator.
Dargos (Armored Reptilian Humanoids)
Very tall (up to 3 m), green, scaled bipeds encased in what witnesses described as segmented, armor-like plating rather than bare reptilian skin alone, with clawed three-fingered hands, glowing or reflective eyes, and a slow, deliberate gait. Distinct from the generic conspiracy-era Reptilian by the specific, repeatedly-detailed 'armored' texture and by claimed telepathic contact delivered through touch rather than speech.
Giant Humanoids
Humanoids 2.5-4 m tall, often headless-looking or with small heads set into massive shoulders, sometimes three-eyed (Voronezh), moving slowly and accompanied by small robots. Distinct from Nordics by sheer scale and a menace-neutral affect — witnesses read them as alien rather than hostile or benevolent.
Greys
Small (0.9-1.4 m), grey- or putty-skinned humanoids with oversized hairless heads, enormous black almond-shaped eyes wrapping toward the temples, vestigial nose and mouth, thin limbs and torso, and four-fingered hands sometimes described with a partial thumb. Usually reported in groups of three to five, moving with clinical, unhurried detachment; communication is almost always described as telepathic rather than verbal, and abductees frequently report an inability to move or scream in their presence.
Hairy Humanoids
Ape-like or fur-covered bipeds, 1.5-3 m tall, reported near landed objects or glowing lights — the point where ufology and cryptozoology overlap most directly. Often described with glowing red eyes and a sulfurous smell; the Venezuelan variant was reported with unusually hard, metallic-feeling skin rather than ordinary hide.
Hybrids
Beings reported as crosses between Greys and humans: near-human faces with oversized dark eyes, thin wispy hair, frail bodies, and skin tone described as somewhere between grey and pale human. Appear almost exclusively inside abduction narratives — presented to abductees as 'their' children in staged nursery scenes aboard craft, sometimes across years of recurring encounters with the 'same' growing child.
Insectoid Workers
Smaller and more overtly insect-like than the Mantids they are typically reported alongside: compact, roughly human-height or shorter figures with beetle- or roach-like exoskeleton sheens, multi-jointed limbs, and small mandible-like mouth structures rather than the Mantid's triangular 'face.' Abduction accounts place them at the bottom of an implied entity hierarchy, performing repetitive procedural tasks under Mantid or Grey direction rather than communicating with witnesses directly.
Light Beings / Energy Forms
Entities reported as made of or wrapped in light: glowing silhouettes, self-luminous orbs that behave with apparent intention, columns of light containing indistinct figures. Common in religiously framed accounts and central to the Colares attacks, where the beams themselves seemed agent-like — targeting, tracking, and burning specific victims rather than simply illuminating.
Mantids
Very tall (2-2.5 m) insect-like figures with triangular heads, huge lateral compound-looking eyes, elongated segmented limbs held in a folded 'praying' posture, and a thin, exoskeleton-like carapace over the torso. In abduction accounts they appear as calm supervisors directing Grey 'workers' and smaller insectoid staff, communicating telepathically and radiating what abductees often describe as an unsettling, non-human patience.
Men in Black
Not occupants but visitors-after-the-fact: pale men in outdated black suits and hats, arriving in immaculate vintage black Cadillacs, speaking in stilted formal English, knowing unpublished details of a sighting, and warning witnesses to stay silent. Frequently described with subtle wrongness — no eyebrows, waxy skin, mechanical diction, an unnatural way of eating or blinking. Excluded from Huyghe-style morphological classification because they present as ordinary humans; the anomaly is behavioral, not physical.
Metallic Ape-Beings
A short, powerfully built, ape- or monkey-like biped reported with unusually hard, cold, metallic-feeling skin rather than fur or hide — witnesses who physically grappled with it described the sensation as closer to touching a machine than an animal, despite its otherwise organic, muscular body and simian face.
Nordics
Human-looking beings of striking beauty: tall (1.8-2.2 m), long blond or white-blond hair, blue or pale eyes, luminous or deeply tanned skin, often dressed in seamless one-piece suits. Reported as serene, articulate, and paternal — frequently delivering warnings about nuclear weapons, ecological collapse, or spiritual complacency, and sometimes inviting contactees aboard for guided tours and philosophical lectures rather than examinations.
Reptilians
Tall (2-2.7 m) bipedal reptiles: scaled green-brown skin, vertical-slit pupils in yellow or gold eyes, muscular builds, sometimes tails or ridged skulls. Reported demeanor ranges from indifferent to overtly menacing; almost never described as communicative in ordinary speech, though some accounts (Zanfretta) claim telepathic contact through touch.
Robots & Androids
Entities that move mechanically or appear artificial: metallic or rubbery surfaces, stiff or gliding motion, absent or minimal facial features. The archetype is the Pascagoula being — roughly 1.5 m, grey wrinkled 'elephant skin', carrot-like protrusions for a nose and ears, lobster-claw pincer hands, and legs that seemed fused into a single supporting column, floating rather than walking as it moved the witnesses.
Shadow Beings
Featureless, wholly black or dark-grey humanoid silhouettes, usually seen at the edge of vision or in a darkened bedroom, often described as 'more solid than a shadow but with no visible texture.' A recurring subtype nicknamed 'Hat Man' adds a wide-brimmed hat to the outline. Encounters are almost always brief, occur at the threshold of sleep, and are accompanied by dread and an inability to move.
Small Humanoids / Goblins
Diminutive beings (0.5-1.2 m) that are neither Greys nor children: oversized heads and pointed ears, glowing or reflective eyes, spindly limbs, sometimes claws. The Hopkinsville type 'floated' and seemed weightless, shrugging off point-blank shotgun fire; the 1954 French wave's dwarfs sometimes wore diving suits or armor (see that entry); Emilcin's Poland-1978 beings were reported with green-tinged faces and offered the witness food.
Suited Dwarfs (1954 French type)
Short beings (0.9-1.2 m) sealed in one-piece 'diving suits' or translucent helmets, often with visible dark faces or large eyes behind visors; associated with landed domed craft, paralysis beams, and hasty departures when approached. Socorro's two small figures were reported in unusually clean white coveralls rather than the darker scaphandre style of the French wave.
Tall Whites
Very tall (up to 2.5 m in accounts), chalk-white skin, thin builds, large blue eyes, near-translucent white hair; described as physically fragile — vulnerable to Earth's gravity and sunlight — but technologically dominant, and as having a working, decades-long arrangement with the U.S. military at a Nevada test range.
The Flatwoods Monster
A singular apparition: 3 m tall, a spade- or ace-of-spades-shaped cowl around a red-glowing face, a dark metallic green 'dress' or casing, small claw-like hands, gliding motion, a hissing sound, and a nauseating metallic mist that reportedly left several witnesses with irritated throats and eyes for days. Seen once, by seven witnesses, for a matter of seconds.
The Varginha Creature
A short (roughly 1.2-1.5 m), thin bipedal creature reported with oily brown or reddish-brown skin, a large head with three small bumps or protrusions, deep-set glowing red eyes, and legs that bent backward like a dog's or kangaroo's hind limbs. Witnesses described a foul, sulfurous odor and a demeanor read alternately as terrified or menacing rather than calm — closer to a cornered animal than a composed 'occupant.'
Winged Humanoids
A roughly man-sized bipedal figure with large folded wings, no visible head (the shoulders reported as rising directly into the torso), and two enormous glowing red eyes set where a face would otherwise be. Reported flight was silent and impossibly fast for the wing size — witnesses described it keeping pace with cars at 100 km/h without a wingbeat.