common inaccuracies and poor comparisons(bad biology and behaviorism) with FiM fanfictions.

Okay, this post is yet another little rant(just me expressing my thoughts in written form). Ehm, continuing on...

I've noticed that a number of stories get IRL equine biology and behavior wrong, and while no expert on the subject, a little research makes this very obvious. As an extension of this HiE(Human in Equestria) and PoE(Pony on Earth) stories get the comparative biology wrong too. Rather than continue grousing on a personal level on these common errors, I am going to just list them and then give the more accurate details.
*Please note this has nothing to do with deliberate breaks from IRL Equine characteristics.*
*or fantastical considerations, that's for another blog post*

1st. Equines have no canines.(mostly false).
--In horses(including IRL Ponies) males(colts, stallions etc.) have canines, barring genetic abnormalities; One-quarter(25%) of females(fillies, mares etc.) have them as well. Pinkie grinning with canines showing is accurate.

2nd. Equines don't eat meat.(somewhat false).
--While generally herbivorous prey animals, equines can and do consume animal matter(in specific meat). A number of nominally herbivorous species do. Meat is eaten opportunistically or is sought out in desperation. This behavior is more noticeable and common with horses(and other herbivores) in high altitudes and/or very dry climates, with sparse plant life. In the case of a horse it is often birds or some other small animal. Deer will do this to(as can be seen on YouTube, with a live songbird...). Horse owners have pointed out that unattended meat products(sandwiches with meat, burgers, hot dogs etc.) have been scarfed by their horse(especially if they have seen a human or companion animal take a bite).
And no, they do not become automatically ill for doing so. Only to much meat or meat gone bad will make them sick(yes, a meat centric diet is bad for them in the long-term, health wise).

3rd. Ponies, Horses and other equines have fur.(technically false)
--One of the major differences between fur and hair is how course it is. Equines have a coat of what is technically hair, not fine(structural quality) fur.

4th. Vision isn't a primary sense for IRL horses and ponies.(false, period)
--Equines have large eyes(overall and relative to their heads), and don't test positive(as a species wide trait) for any notable visual impairments(by human standards). As prey animals they have good monocular vision to their sides, and have good binocular vision forward(with only a small blind spot close to their heads). They are not especially colorblind, equines also have good motion-detection and visual pattern recognition.
Yes, equines have a keener sense of smell and hearing(and a good sense of touch through their coat of hair)

5th. Compared to equines(specifically horses) humans have far greater endurance.(situational)
--Yes, humans can be accurately classed as endurance/persistence predators. But, a lot of this comes into play in hot climates because of how a human body handles temperature regulation(no reliance on panting to cool down, sweating with high efficiency for evaporation cooling). In testing, endurance running between a fit human and a fit horse shows that in cool to cold climates(including non-peak heat time in temperate climates) both can range over the same distance, with the horse having a better(overall) travel time*. As an aside the horse in said test was also carrying a very light load(a few small weights), I believe the human was not.
Now, a fit human(with a lifestyle that calls for it, e.g. a nomad or hunter-gatherer) will range over a greater distance on a day-to-day basis than a typical wild horse. Also note that taking time to graze reduces travel time over long distances(eating a lot of low-energy value plant matter), a human will typically spend less time eating. So... Their are a large number of factors that fit into travel aside from raw endurance. A human is best at near-continuous low speed(walking) travel, and is far less prone to heat exhaustion.

Note 1: Horses and other equines do sweat, and it even works into a lather on their coat during high exertion. For a human sweating is more efficient due to greater exposed surface-area and high saline(salt water) content. Most mammals have 'oily' sweat(e.g. canids such as dogs only have high saline sweat from their paw pads), a related fact: mammary glands are modified sweat glands(some monotremes, feed their young via sweating. They have no mammary glands).

*Note 2: Said test was preformed in Wales.

Note 3:There are "feats" of endurance that aren't suitable for a blog post, so they won't be covered here.

6th. Herds have dominance hierarchies like packs, prides or troops etc.(false, but...)
--Equines and most herd animals do have leaders and a group hierarchy, but are less rigid(at least compared to stereotypes). For equines(leaving aside bachelor herds) you have: a lead mare, and a lead stallion(yes, sometimes there is a beta stallion in a herd). The herd usually follows the lead mare from place-to-place and takes many cues from her(a lead mare has the most say in herd membership). The lead stallion mainly looks out for threats and chases away unwanted males(or at least comes between them and other herdmates). If a herd feels threatened the lead mare is usually in charge of finding a means of retreat and leading it if need be; the lead stallion is in charge of dissuading or distracting threats at the same time.
Now I have said usually and otherwise have made my comments non-absolute, as herd members will follow a trusted herdmate who is confident and/or noticeably experienced. So, in some circumstances another member will temporarily guide the herd in place of the lead mare or stallion. General dominance is determined on a herdmate-to-herdmate basis(it is interpersonal, not always group wide) with lead mare/stallion being the exception(mostly). To keep the rest of this part short I will just point out three things:
1. That conflicts between individual members are short, intense affairs with results that stick(rarely repeat or have outcomes that shift) and are preceded by direct warning behavior.
2. Interference with interpersonal relationships between members is common(generally curtailing them).
3. Oh, and when interacting pairing up is normal(a set of three isn't stable, each member wants one-on-one interaction); thus sequential one-on-one bonding is the norm within the herd.

7th. Equines have a naturally "unbalanced" gender ratio.(false)
--Horses, ponies and indeed most herd mammals have a generally 1:1 gender birth ratio. Males suffer unbalanced death rates, especially when young. Many(most) young adult males belong to all male bachelor herds. A mares + stallion herd is a close family unit as well as a social unit.

Side Note: Wild packs of wolves(for example) are a family unit also. Most early popularized studies on packs in captivity provided erroneous data, they functioned like a population of random prison inmates(because they essentially were).

8th. Comparative strength between humans and equines(this one is strictly non-binary)
--IRL horses and ponies are much stronger overall than humans, but... Pound-for-pound humans and other primates are stronger(most other apes are stronger than a human either pound for pound or overall. Do not provoke a chimp, gorilla etc.). With this you do have to keep in mind that weight and volume are cubed when scaling and strength isn't, its not just about muscle density.
Also remember that a human is better built for dead-lifting weight vertically; an equine is better built for pulling horizontally and dealing with carried weight. This is muscle and bone structure.

9th. Comparing Human durability.
--Humans are fragile, but we have good shock tolerance and heal relatively quickly IRL.

Well, this is covers the most common stuff and is by no means exhaustive. Also, there is a good chunk of things that I shouldn't include in a blog post, so those things are absent.