Why would the Holy Spirit mis-guide the translators of the KJV to employ the use of mythical creatures like "unicorn" for wild ox, "satyr" for "wild goat", "cockatrice" for common viper, when today we know what the real name of these creatures is?
Yet the Holy Spirit never misguides anyone nor can because the Holy Spirit is God Himself. These creatures are not mythical at all and there are answers to each one, just a search of startpage.com proposes whole lists of explanations:
Take the answersingensis.org site about the unicorn:
"The absence of a unicorn in the modern world should not cause us to doubt its past existence. (Think of the dodo bird. It does not exist today, but we do not doubt that it existed in the past.). Eighteenth century reports from southern Africa described rock drawings and eyewitness accounts of fierce, single-horned, equine-like animals. One such report describes “a single horn, directly in front, about as long as one’s arm, and at the base about as thick . . . . [It] had a sharp point; it was not attached to the bone of the forehead, but fixed only in the skin.”
The
elasmotherium, an extinct giant rhinoceros, provides another possibility for the unicorn’s identity. The
elasmotherium’s 33-inch-long skull has a huge bony protuberance on the frontal bone consistent with the support structure for a massive horn.<sup></sup> In fact, archaeologist Austen Henry Layard, in his 1849 book
Nineveh and Its Remains, sketched a single-horned creature from an obelisk in company with two-horned bovine animals; he identified the single-horned animal as an Indian rhinoceros.<sup></sup> The biblical unicorn could have been the
elasmotherium.<sup></sup>
Assyrian archaeology provides one other possible solution to the unicorn identity crisis. The biblical unicorn could have been an aurochs (a kind of wild ox known to the Assyrians as rimu). The aurochs’s horns were very symmetrical and often appeared as one in profile, as can be seen on Ashurnasirpal II’s palace relief and Esarhaddon’s stone prism. Fighting rimu was a popular sport for Assyrian kings. On a broken obelisk, for instance, Tiglath-Pileser I boasted of slaying them in the Lebanon mountains.
Extinct since about 1627, aurochs,
Bos primigenius, were huge bovine creatures. Julius Caesar described them in his Gallic Wars as:
“a little below the elephant in size, and of the appearance, color, and shape of a bull. Their strength and speed are extraordinary; they spare neither man nor wild beast which they have espied . . . . Not even when taken very young can they be rendered familiar to men and tamed. The size, shape, and appearance of their horns differ much from the horns of our oxen. These they anxiously seek after, and bind at the tips with silver, and use as cups at their most sumptuous entertainments.”<sup></sup>
The aurochs’ highly prized horns would have been a symbol of great strength to the ancient Bible reader."
http://www.answersingenesis.org/articles/aid/v2/n1/unicorns-in-bible
About the satyr:
"In Greek and Roman mythology, the satyr was a half-man/half-beast god, a companion of Bacchus. There is absolutely no relationship between this pagan concept and any passage in the Bible.
In the Old Testament, the Hebrew word
sa’ir is found about fifty-two times. It is related to the term
se’ar (“hair”), which means a “hairy one.” Mostly the word is used of the male goat that was employed as a sin-offering – especially that solemn sin-offering of the day of atonement (Lev. 16).
In two cases,
sa’ir is translated “satyr” in the King James Version (Isa. 13:21; 34:14). In those passages it clearly alludes to wild goats of the sort that lived among the ruins of Babylon and Edom. Twice the term is rendered “demon” (Lev. 17:7; 2 Chron. 11:15 — KJV), where it actually signifies a pagan god that takes the form of a goat. And so, once more, careful investigation demonstrates that the writers of the Bible have not lowered themselves to the superstitions of paganism. Critical charges ever destruct upon the shoals of truth."
What About the "Unicorn" and the "Satyr"? : ChristianCourier.com
When I was a baby Christian I wholeheartedly believed that unicorns once did exist and were simply now extinct because of their mention in the Bible. I felt the same way about dragons....and to this day, my mind is opened to the possibility. 
totopic
