Ulysses Aldrovandus,[216] who published a large folio volume on serpents and dragons, entirely believed in the existence of the latter, and gives two wood engravings of a specimen which he professes to have received in the year 1551, of a true dried Æthiopian dragon. He describes it as having two feet armed with claws, and two ears, with five prominent and conspicuous tubercles on the back. The whole was ornamented with green and dusky scales. Above, it bore wings fit for flight, and had a long and flexible tail, coloured with yellowish scales, such as shone on the belly and throat. The mouth was provided with sharp teeth, the inferior part of the head, towards the ears, was even, the pupil of the eye black, with a tawny surrounding, and the nostrils were two in number, and open. He criticises Ammianus Marcellinus for his disbelief in winged dragons, and states in further justification of his censure that he had heard, from men worthy of confidence, that in that portion of Pistorian territory called Cotone, a great dragon was seen whose wings were interwoven with sinews a cubit in length, and were of considerable width; this beast also possessed two short feet provided with claws like those of an eagle. The whole animal was covered with scales. The gaping mouth was furnished with big teeth, it had ears, and was as big as a hairy bear. Aldrovandus sustains his argument by quotations from the classics and reference to more recent authors. He quotes Isidorus as stating that the winged Arabian serpents were called Sirens, while their venom was so effective that their bite was attended by death rather than pain; this confirms the account of Solinus. He instances Gesner as saying that, in 1543, he understood that a kind of dragon appeared near Styria, within the confines of Germany, which had feet like lizards, and wings after the fashion of a bat, with an incurable bite, and says these statements are confirmed by Froschonerus in his work on Styria (_idque Froschonerus ex Bibliophila Stirio narrabat_). He classes dragons (which he considers as essentially winged animals) either as footless or possessing two or four feet. He refers to a description by Scaliger[217] of a species of serpent four feet long, and as thick as a man's arm, with cartilaginous wings pendent from the sides. He also mentions an account by Brodeus, of a winged dragon which was brought to Francis, the invincible King of the Gauls, by a countryman who had killed it with a mattock near Sanctones, and which was stated to have been seen by many men of approved reputation, who thought it had migrated from transmarine regions by the assistance of the wind.