An Erin (pronounced Ee-rihn) is a species that is neither canine, rodent, weasel, reptile, insect, amphibian, primate, extraterrestrial, or feline, rather, they are a unique class of mammals. Both male and female posses tell-tale antennae that sit on their heads, though, these things serve no real purpose.

Overall Biology

Male and female erins have evident characteristic gender traits. Females tend to have large hips, which is usually evident by their curves. Her eyes are large and she possess soft fine hair. Her breast size may vary from large to small or, rarely, unnoticeable. She may (though not always) possess a hymen that tends to be completely torn during intercourse but, rather oddly, (if she has one) is only partially torn during childbirth (see reproduction section below).

Males posses soft but bristle-like hair and generally have small eyes. Males are more muscular than females and, obviously, have no curves. Females also are shorter than the males by 5-9 inches.

At ages 53 or 54, possibly older, is when the females lose their ability to reproduce and, besides a few outside factors, can almost never stop reproducing before then, however, they can be rendered infertile if severe enough damage has occured.


This species has two ways of reproduction.

They reproduce in pretty much the same way any species would but females can also reproduce asexually, if intended or needed, because they can actually impregnate themselves but the pregnancy lengths vary, depending on the conditions, when her hormones skyrocket. If a female reproduces asexually once, she gains the ability to reproduce at will and may do so very quickly. When a female's egg is fertilized, it develops from zygote to embryo within a matter of hours and develops into fetus within a few days

Pregnancy tends to have no real noticeable traits aside from the female's hips getting rounder and her body getting heavier (her abdomen may protrude slightly, about 3-6.5 inches, if it does), rather, pregnancy can be best observed by their behaviour and eating habits, as anything besides the aforementioned are less overt or rare. Multiple births are uncommon.

Because this species' pregnancy can end whenever and, whenever they are born, they are born fully developed, a premature birth is rare. However, it would be considered rather premature, if they are born less than a month. The only signs of babies being born premature are small size and poorly developed hands or feet or arms or legs.

Aging and Lifespan

Erins do not age very fast but it seems they age much slower than other species. When they are children, they age in accordance to other species but when they are adults, they age even slower than other species. Why do they age so slowly, is a mystery but it might have something to do with how long they tend to live. In that kind of context, due to how slow they age, one could be extremely old and they might appear to be middle aged.

The only symptoms of their old age are silvery-white hair, slight wrinkles around the eyes, and weak vision (if they are nearsighted then that would be bothersome because their vision would get weaker) but those are the only symptoms that are present.

They tend to live for about two or three millenia, with five millenia being the most and one at the least. Overall, their lifespan ranges from about 300-3,000 years, 5,000 being the exception and 200 being the least.

Healing and Survival

Erins have been known to survive circumstances that would be typically be considered fatal or life-threatening. It can be assumed that, because they tend to live longer than most, their healing factor may be a tad faster (or slower). Thus, this can render them decently tolerant to pain and hardier, along with being slightly indestructible.

This, however, doesn't mean they can't die through via injuries or injuries and neither do they heal from their injuries perfectly.


The color of an erin's blood is red when has oxygen in it, as one could observe by them bleeding. Deoxygenated blood is pink or magenta but the bruises appear blue or purple.

Apparently, some eirns possess toxic blood that can cause adverse effects if it's transferred into someone else's veins. A common form of this would be crystallization, which is triggered by rapid immuno-response of person affected but,

Toxins and Immunity

Some of erins have toxic properties while others may not.

Generally, erins usually use bacteria (which would cause the bite to swell up), more so than venom unless forced. The toxins in their bodies can be deadly, depending on the amount injected and the size of the person, making them highly poisonous. In order to be cured, one must tie off the artery and draw out the toxin or be injected with antivenin but one would have to go to the hospital for either one of the latter.

Generally, erins born with them but their bodies creates new toxins, depending on the things, i.e. plants, they have been exposed to. Erins are immune to their own toxins and the toxins of the same sub-species. However, if a member of a different sub-species bites one of them, they will be injured but not severely harmed because they have some immunity to different sub-species toxins.

It is variable but if infants born with toxic properties, then they would be rather benign and would only cause pain to the one bitten but the pain can last for a week.


An erin's teeth must be decently sharp if can do some serious damage just by gnawing through a metal chain-link barbed-wire fence. An erins teeth are extremely different and always grow back, so they have 'baby teeth' all the time. Every time they lose their teeth, they regrow, they never stop regrowing but how long it takes for them to regrow varies. When they start to come in, an erins gums hurt, so they gnaw on things to make them feel better. Their teeth often tend to to house bacteria or venom.

Infantile erins are generally born with teeth because their diet is not entirely liquid (more specifically, milk) that is common with other species but their teeth are small and hardly seen, as well as slightly underdeveloped, so they would probably be able to eat softened or slightly solid food. It should be noted that their teeth can't do much damage to anything, except skin and fabric.


Usually, erins do not hibernate and that depends on whatever the circumstance is. While they do not usually hibernate, they go torpid for a period of time, if they are not used to the cold. If they do hibernate, it is usually for a reason, like a regenerative state.


Erins use grunts, whenever they try to get each other's attention, they screech or hiss to show they won't tolerate each other's bad company or company at all, they squeal whenever they are physically hurting each other and they want to stop or when they in distress, they growl whenever they are upset and as warning whenever we're going to fight, and they squeak whenever we're inquiring about something. In short, they use many vocalizations.

Infants communicate pretty much in the same way as the adults of the species.

They cry, like typical babies. They grunt whenever they're trying to bring notice to something or to get attention. They squeal and scream whenever they are in distress or injured and they need their mothers. They laugh and giggle whenever they express happiness or whenever they find something entertaining. They squeak whenever curious or inquiring or, at times, trying to get attention. Since, they can't growl or screech, yet, they bite or snap their teeth and/or try to scratch (their claws can do some harm). Those are the only vocalizations that can be thought of.

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