These two vastly different species are constantly misnamed for one another and confused by those adventurers who tend to be easily confused. To settle the matter as a record of reference for those who need such things, I offer a brief synopsis on two creatures that would not otherwise appear in any manual on the same page.
Lizard-bulls are scaly reptilian behemoths, shaped rather like bovine, and sporting curved, wicked horns. They prefer fetid swamps. Their flesh is resistant to most weapons, their nostrils steam forth poisonous fumes and their random violent attacks are to be avoided whenever possible. These beasts have been known to devour adventurers whole. Beware as well, their epic screeches!
Bull-lizards are tiny gecko-like reptiles with miniscule horn-like protuberances. These are used mainly during mating season when the otherwise harmless little lizards square off against each other amidst the sands, oblivious to everything around them. Their favored habitat is dry steppe. They feed on thorny shrubbery and avoid all hostile threats by running away as fast as their little legs can carry them. Their powdered little horns sell for good coin among alchemists.
Refer to above whenever unsure of which creature you are facing.
Additional Ideas (1)
Let me once again address the differences between these often and sometimes tragically confused names, so that needless bloodshed can be avoided by the confused adventurer.
I will just say if forced to pick between the two as adversaries, I would have to think on it for a half-minute but probably take my chances with the big dumb birds.
A gigantic but rather harmless bird. Well, mostly harmless. The truth is it is rather dangerous. It is after all a gigantic bird so caution should be used during encounters. Literally the size of oxen these creatures act in every way as their mundane tiny cousins. Why they exist is anyone's guess. We can only hope this was not yet another one of those "wizard's experiment gone awry", or worse, a "practical joke of the gods." If every one of these (thankfully rare), dive-bombing, cottage-crushing behemoths were exterminated, the world would be a safer place for adventurers.
Unlike their (much) lesser cousins who utilize speed and quick strikes to hunt insects, Ox-swallows seem to rely on their obnoxious strength and brute force to hunt, well, anything that looks edible to their fist-sized soulless, shining-black eyes!
Fearsome chieftain and war-leader of the Tribe of the Great Boast, Swallow-Ox earned her name, and should never be confused with an Ox-Swallow.
This giant of a woman was said to have swallowed an entire roasted ox in a single gulp. The truth of the matter is that she probably ate a whole haunch of ox quickly, or perhaps a huge portion of ox in one sitting, but we will never know for sure. Regardless, this earned her name and eventually her position. Well that and the fact that her ferocity in battle is unmatched, as her skill with the long-axe unrivaled. Swallow-Ox commands four hundred mustached (the women as well), axe and shield wielding berserkers, and should be avoided at all costs. Unless your are planning a war, in which case know that the tribe of the Great Boast are willing mercenaries. Swallow-Ox always demands payment in gold.