This is from a book; "Royal Natural History, by Richard Lydekker, published in 1896” Although it is grossly inaccurate regarding horned lizard care and feeding, it is very interesting non-the-less. I thought you all might enjoy. (But please don't take it as any kind of authority on HL care!) 
Horned Lizards The last and at the same time the most peculiar members of the Horned present family are the horned lizards of North America and Mexico, Lizards which may be regarded as the representatives of the moloch lizard among the agamoids. From their short, rounded heads, abbreviated bodies, and shortened tails, coupled with a general batrachian appearance, these lizards are commonly termed toads in America, the popular name of the figured species (Phrynosoma cornutum) being the Californian toad. Strange, not to say ugly, in appearance, these lizards are at once distinguished from all their allies by the presence of several bony spines projecting from the back of the shortened head, and of tubercles or spines scattered among the ordinary scales of the body. In form, the body is broad and depressed, without any crest down the back and the tail is very thick at the base and never longer than the body. The limbs are rather long, with pores on the thighs, and keeled plates on the lower surfaces of the toes. From most other members of the family these lizards are further distinguished by the absence of teeth on the palate. Of the twelve species of the genus the best known is the common horned toad, herewith figured, which has the tail longer than the head, distinct spines on the back, and the drum of the ear naked. Its general appearance is even more than superficially toad-like, the head being as broad as long, and the body being remarkable for its extreme plumpness. Measuring a little over five inches in length, this species is rather handsomely colored. Above, the ground color is grayish or brownish, with a more or less well-marked light stripe down the back, and dark brown spots at the bases of the larger spines; there are like-wise markings of the same color on the nape and head. Beneath, the hue is yellowish, with or without a few small brown spots. In two species of the genus (e. g. P. taurus) the tail does not exceed the head in length. The common species is found locally in sandy districts both on the plains and mountains, and is in some places abundant, although from its coloration frequently escaping notice. 1n spite of its somewhat formidable appearance, it is a harmless creature, not attempting to bite even when captured. Lacking the protrusive tongue of the chameleon, and being debarred by its clumsy form from running fast, the horned lizard is unable to capture the swifter insects, and consequently preys upon sand-haunting beetles, whose speed is inferior to its own, such prey being generally captured in the evening, and the creature lying passive on the sand during the day. Some species of horned lizards are remarkable as being the only members of the family, save one other genus, which produce living young; the number of young being in some instances as many as twenty-four. Always small feeders, these lizards are capable of undergoing long fasts with impunity; and as they are habituated to a dry atmosphere, and probably never drink, they may be sent packed in wadding long distances by post.
The most remarkable peculiarity connected with these lizards is their habit of ejecting jets of blood from the eyes, apparently as a means of defense. The following letter from Mr. V. Bailey, written from California, in 1891, describes the phenomenon as first observed. by him: “ I caught a horned toad to-day that very much surprised Dr. Fisher and myself by squirting blood from its eyes. It was on smooth ground, and not in brush or weeds. I caught it with my hand, and just got my fingers on its tail as it ran. On taking it in my hand, a little jet of blood spurted from one eye, a distance of fifteen inches, and spattered on my shoulder.
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2 Kings 6:15-17
