Some of the various 22 sub-species of Grays originally started out as tall blond-haired humanoids in the Lyrae system, but were subject to heavy radiation due to a nuclear exchange over a long period of time, changing their DNA to the point where some of the species became stunted misshapen dwarves.  Glandular structures were also effected, including reproductive and digestive organs.  The nuclear exchange occurred approximately 10,450 years ago.           These type of Grays have been referred to as being the "Orion Crusaders" or the "Markabians".  Source: Rigel is a star on the left foot of the Orion Constellation.   These aliens have technological superiority but appear to be lacking in spiritual and social sciences.  This is evident in their obvious lack of warmth, emotionality, and respect relative to humans.  They can sometimes obtain momentary pleasure in terms of mood elevation by tuning in on human wavelengths via telepathically connected radionic devices.  They react to intense human emotion such as ecstasy or agony; "UFOS" in war zones, Nazi vs. Jew.  They blanket couples for sexual thrills and are drawn to aberrants and sexual deviates.  The Markabs use sex, pain, drugs and fear as obsessive elements with which to aberrate humans.   The Gray species is not based on individualization or being an individual entity.  For entities maintaining a group mind set (social memory complex), individualization seems to cause a great deal of random energy loss.  They were initially fascinated with both human individuality and the human emotional spectrum, which they can perceive but apparently do not comprehend what it means (to the human).   Species objectives appear to be founded on a rigid domination survival-based social order, where their "religion" is science, their social structure is geared to obedience and duty, their military concepts are grouped around conquest, colonization, and domination through covert mind control programs.                 The main operative in their social structure is obedience and duty, and it has become apparent that there are definite hierarchies within their social structures which provide for each entity having specific duties to perform.   There are two main types of the tall Gray species who call themselves the EBAN. Type 1 of the Orion Grays are about seven to eight feet tall and have what you would call an insect-base to their genetic makeup.  They have a pronounced nose and slanted black eyes.  They have no external genitalia and are extremely aggressive toward humans.  Type 2 of the tall Orion Grays are between six and seven feet tall and have external genitalia.  This type appears to be a taller form of the short Gray species with similar large heads and large black eyes.
The Grays operate very efficiently in the dark.  Their eyes are more sensitive to ultraviolet light.  They have the ability to control their heart rate.  The normal heart rate for a Gray is above that of a human.  The skin seems to have a metallic content and an unusual cobalt pigmentation.   The brain has been described as having many more lobes than the human brain.  There have been previous references to crystalline networks that have been found in the brains of some of the alien autopsies.  It is believed that the network has a functional relationship to telepathic communication and acts as a functional node for group control of the cloned species, which function in what is essentially a hive mind.            The Gray species maintains a group mind set without individuality.  They are fascinated by the human emotional spectrum, which they can perceive but not comprehend.  They are almost entirely devoid of emotions, but can obtain a second-hand  "high" by telepathically tuning in to different kinds of intense human emotions, such as ecstasy or agony. Certain types of unusual sexual practices attract these entities like flies.
They have problems with their glands, particularly with their sebaceous glands, which make it difficult for them to digest food. They derive nourishment from the glandular secretions and enzymes that they extract from animals that they mutilate.  They absorb these extracts through the pores in their skin.            This process involves spreading a biological slurry mixture onto their skin that has been mixed with hydrogen peroxide to eliminate bacteria.  Waste products are then excreted back through the skin.  There are a distinct series of odors similar to a mentholated cinnamon smell associated with this process.
An interdimensional being, known as Ramtha, described the Grays in this manner: "They are in the throws of a dying evolution to where they have become so intellectual that they have burned away emotion.  They have great difficulty in understanding love, touch, embrace, a warm hand.  They are the galactic geniuses.  They are poor in spirit. Now, these are the most notoriously known.   Their primary leader is a woman.  And, the woman is beautiful to some degree.  Very strong. But genetically, she comes from the people who you are connected with.  She's apart of their strain for she looks different than all of her people.  She is, in a sense, their Goddess, if you wish to see it that way.  She is endeavoring to reproduce the strain of her genetic line and her genetic line is most similar to you.  It is most similar in evolution to where, not only is the civilization combined as civilized, scientific mind, but it is coupled with the intuitive, the spiritual, and the mystic.  The spirit.  That is the idealism that she is endeavoring to be replanted and reseeded.           This woman's people are small, very fragile, very tender.  Their bones are easily broken.  If you grabbed them, you would break their limbs and their great black eyes would fill with red water.  They a very thin.  Their skin is not bronze.  It is not burned to death like yours is.  It's not leathery.  It's not white.  It's not black.  It is bluish.  It is consistent with their sun.  It has a gray hew to it, therefore the appearance of being unhealthy.  They are very healthy to what they are genetically capable of being healthy as.          They have, over billions of years in the time flow, eroded away genetically from being great and beautiful, similar to my people.  To becoming genetically, through evolution, fitting exactly what they were evolving to; scientific knowledge.  Knowledge, knowledge, knowledge. And at one point in their genetic history, they had a very firm belief of doing away with the emotional, or weak side, of their character, which are the emotions.  And, they have bred out emotion and they have bred in intellect.   They are the geniuses.  They are the ones who can set a nova into motion and explode it.  They are the ones that are matter gatherers of the universe.  They gather matter. They create from it.  Matter creates in front of them.  It is coexistent with their image.  They can create their image out of raw matter.  Bazaar, yes.  I know.  Hard for you to take because you are conditioned to think in fear terms.  In monstrous terms.  You don't have the mind to think of a civilization that is that powerful.  Yet, that empty."