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A species from the planet Irk.

BIOLOGY:
Their skin is very dry but their insides contain compressed excesses of liquid. Because of this, their body chemistry is volatile and concentrations of adrenaline can allow them superior speed and strength for short periods of time.

Irkens are sensitive and irritable when exposed to many Earth-based resources, but few (if any) materials can cause lasting injuries.

It is estimated that they are reptilian based off of the Mysterious Mysteries host describing Zim as having scales. However, Irkens do not seem to mate in modern society, being genetically manufactured (see Gattaca). Despite being presumably reptilian, Irkens have very humanistic proportions as well as mammal-like tendencies, behaviors, and movements.

Lastly, Irkens are a form of cyborg, their PAKs being cybernetic technology fused into their neural system, allowing them the use of four extra limbs (each containing a laser), and a communication device.

PSYCHOLOGY AND SOCIETY:
Irkens are very similar to humans in having megalomaniac and dominative tendencies. Their culture is similar to Asian culture, the civilians being hardworking and loyal to the Almighty Tallest.
Dib: He's not human! He's Irken!
Irken by Kwing April 6, 2010
Related Words
irkled irklefirkle ickle irken irked icklet ikkle Ilkley Inkle Inkler
Another word for "little". Seems to originate in England.
There's an ickle kitten on the doorstep.
ickle by Kally November 29, 2004
A word now in common usage originating from baby speak of the word little - a common mispronunciation by children when learning their early words, which has become poplarised and cutesy as a result. See also widdle.
Oh, has diddums got himself an ickle rattle?
ickle by wildilocks January 2, 2006
A person who is cool in real life but a total ass online. Often these people find their way to IRC thanks to dumbass-proof applications like mIRC.
Maverick is ok in real life but a dick on IRC. He's an IRLer.
IRLer by J4k3 October 11, 2004
foreigner: "why are there so many old people around?"
Ilkley inhabitant: "they are queuing up to die"
Ilkley by InTheKnow;) August 25, 2012
Irkins inhabit the planet of Irk. The goal of the irkin race is to Conquer the entire galaxy or universe, both are stated wich is correct. Unknown.
Zim is an irken. The irkin society will also be stated by me from the scary monkey website.