This strange creature found its way into several works on the freakish or the prodigious, including Johnson's Elizabethan Era bestiary.
Source:
P. Gasparis Schotti. Physica Curiosa, Sive Mirabilia Naturæ et Artis Libris. Herbapoli (Wurzburg): J. A. Endeteri & Wolfgangi, 1667. Page 923, Plate 48.