I just finished working through EpBarn 10. There is some strange stuff in there as regards basic understanding of anatomy (of rabbits) and reproductive systems (of hyenas and weasels).

Why bring this up? It makes me wonder how much stuff we miss in our reading of the Hebrew Bible and Greek New Testament because, simply, we view such things differently than they did. Here is EpBarn 10.6-8, with some comments interspersed:

(6) Furthermore, “You shall not eat the hare.” Why? Do not become, he means, one who corrupts boys, or even resemble such people, because the hare grows another opening every year, and thus has as many orifices as it is years old. (EpBarn 10.6, Holmes)

First, note that two different words for "hare" are used in the same verse. Basically (caution, this may not be family-friendly) Barnabas says that for each year the rabbit lives, it grows a new anus. The Greek word is ἀφόδευσις, BDAG "anus of hares", this being the only citation in BDAG's source corpora. On the word, BDAG provides the helpful parenthetical note "Pliny, NH 8, 81, 218 Archelaus auctor est, quot sint corporis cavernae ad excrementa lepori, totidem annos esse aetatis=according to Archelaus the number of apertures for a hare’s excrements equals the years of its lifespan." I'll let you guess what "one who corrupts boys" might be meaning (hint: BDAG glosses the word as "pederast"). Barnabas draws a parallel between the uncleanliness of the rabbit and pederasts. In the same way you don't eat rabbits, avoid pederasts (associating the hare's defecational peculiarities with its uncleanliness as some justification for the statement). But how much of that would make any sense without a good lexicon? I don't know. I don't even know what Kirsopp Lake was thinking when he translated the latter portion of the verse "Because thou shalt not, he means, become a corruptor of the young, or become like such men; for the rabbit multiplies during every year its retirements by the way; for it has as many burrow-holes as it lives years" unless he was just trying to be diplomatic and appeal to the Victorian sensibilities of the era. Lake is less convoluted, but some portion of the analogy is lost.

(7) Again, “Neither shall you eat the hyena.” Do not become, he means, an adulterer or a seducer, or even resemble such people. Why? Because this animal changes its nature from year to year, and becomes male one time and female another. (8) But he also hated the weasel, and with good reason. Do not become, he means, like those men who, we hear, with immoral intent do things with the mouth that are forbidden, nor associate with those immoral women who do things with the mouth that are forbidden. For this animal conceives through its mouth. (EpBarn 10.7-8, Holmes, emphasis mine)

So, hyena are unclean because they actually change sex (φύσις) from male to female each year (καὶ ποτὲ μὲν ἄρρεν, ποτὲ δὲ θῆλυ γίνεται)? I've seen hyena in the wild (and took some pictures, one is below, more here) when I was in South Africa. They seem pretty normal to me:

My point in writing all of this isn't to berate the anatomical and biological understanding of the author of EpBarn. These sorts of understandings seem to be foundational for him, and assumed to be understood by his initial readership. But they are clearly not the way we today look at such things.

What sorts of things are we missing because our understanding in such areas is much different than that of the ancients? One potential item may be the discussion in 1Co 11. See an older post on Michael Heiser's blog, scroll down to the last item in the "required reading" portion of the post; you may be interested in some of the subsequent posts (here and here) discussing this sort of thing.

Apart from simply investing oneself in the primary and secondary (and tertiary) source material ("read, read, read"), what are some other ways that we today can become more aware of such blind spots that have a propensity to affect our understanding and therefore interpretation of these texts we hold so dear?